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DEVICE FOR DISTILLATION DECOLORIZATION AND PURIFICATION OF ALCOHOL AND METHOD FOR PURIFICATION IN MALTOL PRODUCTION

20230312445 · 2023-10-05

    Inventors

    Cpc classification

    International classification

    Abstract

    Disclosed is a device for distillation decolorization and purification of alcohol in maltol production. The device comprises a rectification column, an alkali hydrolysis kettle and an alkali hydrolysis rectification column. An upper outlet of the rectification column is connected to an inlet of the alkali hydrolysis kettle, an outlet of the alkali hydrolysis kettle is connected to an inlet of the alkali hydrolysis rectification column, and an upper outlet of the alkali hydrolysis rectification column is connected to an inlet of a finished product tank. Further disclosed is a method for distillation decolorization and purification of alcohol in maltol production. A product processed by the solution of the present application has a high purity.

    Claims

    1. A device for distillation decolorization and purification of alcohol in maltol production, is characterized in that, comprising a rectification column, an alkali hydrolysis kettle, and an alkali hydrolysis rectification column; an upper outlet of the rectification column is connected to an inlet of the alkali hydrolysis kettle, an outlet of the alkali hydrolysis kettle is connected to an inlet of the alkali hydrolysis rectification column, and an upper outlet of the alkali hydrolysis rectification column is connected to an inlet of a finished product tank.

    2. The device for distillation decolorization and purification of alcohol in maltol production according to claim 1, is characterized in that, further comprising a first condenser, a second condenser, and a third condenser, the first condenser is connected to an upper outlet of the rectification column, the alkali hydrolysis tank is connected to the second condenser through a circulation pipeline, and an upper outlet of the alkali hydrolysis rectification column is connected to the third condenser.

    3. The device for distillation decolorization and purification of alcohol in maltol production according to claim 2, is characterized in that, the other end of the first condenser other end is connected to an inlet of the reflux tank, an outlet of the reflux tank is connected to the rectification column through the first reflux pump, and a lower part of the rectification column is connected to the first reboiler through a circulation pipeline.

    4. The device for distillation decolorization and purification of alcohol in maltol production according to claim 2, is characterized in that, the other end of the third condenser is connected an inlet of the finished product tank, an outlet of the finished product tank is connected to the alkali hydrolysis rectification column through the second reflux pump, a lower part of the alkali hydrolysis rectification column is connected to the second reboiler through a circulation pipeline, and bottom of the alkali hydrolysis rectification column is connected to the second extraction pump.

    5. The device for distillation decolorization and purification of alcohol in maltol production according to claim 1, is characterized in that, further comprising a first feed pump, a first condenser, a reflux tank, a first reflux pump, a first reboiler, a first extraction pump, a second condenser, an alkali hydrolysis receiving tank, a second feed pump, a third condenser, a finished product tank, a second reflux pump, a second reboiler, and a second extraction pump, the first feed pump is connected to an inlet of the rectification column, the first condenser is connected to an upper outlet of the rectification column, the other end of the first condenser is connected to an inlet of the reflux tank, an outlet of the reflux tank is connected to the rectification column through the first reflux pump, a lower part of the rectification column is connected to the first reboiler through a circulation pipeline, bottom of the rectification column is connected to the first production pump, an outlet of the reflux tank is connected to an inlet of the alkali hydrolysis kettle through the other pipeline, the alkali hydrolysis kettle is connected to the second condenser through a circulation pipeline, an outlet of the alkali hydrolysis kettle is connected to an inlet of the alkali hydrolysis receiving tank, an outlet of the alkali hydrolysis receiving tank is connected to an inlet of the alkali hydrolysis rectification column through the second feed pump, an upper outlet of the alkali hydrolysis rectification column is connected to the third condenser, the other end of the third condenser is connected to an inlet of the finished product tank, an outlet of the finished product tank is connected to the alkali hydrolysis rectification column through the second reflux pump, a lower part of the alkali hydrolysis rectification column is connected to the second reboiler through a circulation pipeline, and bottom of the alkali hydrolysis rectification column is connected to the second extraction pump.

    6. A purification method using the device for distillation decolorization and purification of alcohol in maltol production according to claim 1, is characterized in that, comprising the following steps: (1) pumping crude alcohol into the rectification column at a speed of 1.5 m.sup.3/h by the first feed pump, heating the crude alcohol in the rectification column by the first reboiler with temperature of 85-87° C. at the bottom of the rectification column and temperature of 76-78° C. at the top of the rectification column, condensing the material distilled from the rectification column by the first condenser and sending the material into the reflux tank, refluxing one part of the material in the reflux tank and extracting the other part of the material into the alkali hydrolysis kettle with a reflux ratio of 0.6, and extracting the waste at the bottom of the rectification column by the first extraction pump; (2) adding caustic soda into the alkali hydrolysis kettle with amount of 25 kg caustic soda per 4 m.sup.3 material, increasing temperature up to 77-78° C., holding the temperature for 1 h to finish alkali hydrolysis, and sending the material into the alkali hydrolysis receiving tank; (3) pumping the material in the alkali hydrolysis receiving tank into the alkali hydrolysis rectification column at a speed of 1 m.sup.3/h by the second feed pump, heating the material in the alkali hydrolysis rectification column by a second reboiler with temperature of 80-82° C. at the bottom of the alkali hydrolysis rectification column and temperature of 77-78° C. at the top of the alkali hydrolysis rectification column, condensing the material distilled from the rectification column by the second condenser and sending the material into the finished product tank, refluxing one part of the material in the finished product tank with a reflux ratio of 1.5, extracting qualified alcohol in the finished product tank after sampled and tested, and extracting the waste at the bottom of the alkali hydrolysis rectification column by the second extraction pump.

    7. A purification method using the device for distillation decolorization and purification of alcohol in maltol production is characterized in that, comprising the following steps: Step 1: pumping crude alcohol into the rectification column with temperature of 85-87° C. at the bottom of the rectification column and temperature of 76-78° C. at the top of the rectification column, refluxing one part of the material distilled from the rectification column, extracting the other part of the material into the alkali hydrolysis kettle with a reflux ratio of 0.6; Step 2: adding caustic soda into the alkali hydrolysis kettle, increasing temperature up to 77-78° C., and holding the temperature to finish alkali hydrolysis; Step 3: sending the material processed by holding to finish alkali hydrolysis in step 2 to the alkali hydrolysis rectification column with temperature of 80-82° C. at the bottom of the alkali hydrolysis rectification column and temperature of 77-78° C. at the top of the alkali hydrolysis rectification column, refluxing one part of the material distilled from the alkali hydrolysis rectification column with a reflux ratio of 1.5.

    8. A purification method using the device for distillation decolorization and purification of alcohol in maltol production according to claim 7, is characterized in that, comprising the following steps: the reflux ratio in step 1 is 0.6.

    9. A purification method using the device for distillation decolorization and purification of alcohol in maltol production according to claim 7, is characterized in that, comprising the following steps: the reflux ratio in step 3 is 1.5.

    Description

    BRIEF DESCRIPTION OF FIGURES

    [0016] FIG. 1 is a schematic diagram of the process of the invention.

    DETAILED DESCRIPTION

    Embodiment One

    [0017] Referring to FIG. 1, a device for distillation decolorization and purification of alcohol in maltol production comprises a first feed pump 1, a rectification column 2, a first condenser 21, a reflux tank 22, a first reflux pump 221, a first reboiler 23, a first extraction pump 24, an alkali hydrolysis kettle 3, a second condenser 31, an alkali hydrolysis receiving tank 32, a second feed pump 33, an alkali hydrolysis rectification column 4, a third condenser 41, a finished product tank 5, a second reflux pump 51, a second reboiler 42, and a second extraction pump 43. The first feed pump 1 is connected to an inlet of the rectification column 2, the first condenser 21 is connected to an upper outlet of the rectification column 2, the other end of the first condenser 21 is connected to an inlet of the reflux tank 22, an outlet of the reflux tank 22 is connected to the rectification column 2 through the first reflux pump 221, a lower part of the rectification column 2 is connected to the first reboiler 23 through a circulation pipeline, bottom of the rectification column 2 is connected to the first production pump 24, an outlet of the reflux tank 22 is connected to an inlet of the alkali hydrolysis kettle 3 through the other pipeline, the alkali hydrolysis kettle 3 is connected to the second condenser 31 through a circulation pipeline, an outlet of the alkali hydrolysis kettle 3 is connected to an inlet of the alkali hydrolysis receiving tank 32, an outlet of the alkali hydrolysis receiving tank 32 is connected to an inlet of the alkali hydrolysis rectification column 4 through the second feed pump 33, an upper outlet of the alkali hydrolysis rectification column 4 is connected to the third condenser 41, the other end of the third condenser 41 is connected to an inlet of the finished product tank 5, an outlet of the finished product tank 5 is connected to the alkali hydrolysis rectification column 4 through the second reflux pump 51, a lower part of the alkali hydrolysis rectification column 4 is connected to the second reboiler 42 through a circulation pipeline, and bottom of the alkali hydrolysis rectification column 4 is connected to the second extraction pump 43.

    Embodiment Two

    [0018] A purification method using the device for distillation decolorization and purification of alcohol in maltol production comprises the following steps: [0019] (1) pumping crude alcohol into the rectification column at a speed of 1.5 m.sup.3/h by the first feed pump, heating the crude alcohol in the rectification column by the first reboiler with temperature of 85° C. at the bottom of the rectification column and temperature of 76° C. at the top of the rectification column, condensing the material distilled from the rectification column by the first condenser and sending the material into the reflux tank, refluxing one part of the material in the reflux tank and extracting the other part of the material into the alkali hydrolysis kettle with a reflux ratio of 0.6, and extracting the waste at the bottom of the rectification column by the first extraction pump; [0020] (2) adding caustic soda into the alkali hydrolysis kettle with amount of 25 kg caustic soda per 4 m.sup.3 material, increasing temperature up to 77° C., holding the temperature for 1 h to finish alkali hydrolysis, and sending the material into the alkali hydrolysis receiving tank; [0021] (3) pumping the material in the alkali hydrolysis receiving tank into the alkali hydrolysis rectification column at a speed of 1 m.sup.3/h by the second feed pump, heating the material in the alkali hydrolysis rectification column by a second reboiler with temperature of 80° C. at the bottom of the alkali hydrolysis rectification column and temperature of 77° C. at the top of the alkali hydrolysis rectification column, condensing the material distilled from the rectification column by the second condenser and sending the material into the finished product tank, refluxing one part of the material in the finished product tank with a reflux ratio of 1.5, extracting qualified alcohol in the finished product tank after sampled and tested, and extracting the waste at the bottom of the alkali hydrolysis rectification column by the second extraction pump.

    [0022] After testing, the water content of the obtained ethanol is 0.6% and the impurity content is 3.2%.

    Embodiment Three

    [0023] A purification method using the device for distillation decolorization and purification of alcohol in maltol production comprises the following steps: [0024] (1) pumping crude alcohol into the rectification column at a speed of 1.5 m.sup.3/h by the first feed pump, heating the crude alcohol in the rectification column by the first reboiler with temperature of 86° C. at the bottom of the rectification column and temperature of 76° C. at the top of the rectification column, condensing the material distilled from the rectification column by the first condenser and sending the material into the reflux tank, refluxing one part of the material in the reflux tank and extracting the other part of the material into the alkali hydrolysis kettle with a reflux ratio of 0.6, and extracting the waste at the bottom of the rectification column by the first extraction pump; [0025] (2) adding caustic soda into the alkali hydrolysis kettle with amount of 25 kg caustic soda per 4 m.sup.3 material, increasing temperature up to 77.5° C., holding the temperature for 1 h to finish alkali hydrolysis, and sending the material into the alkali hydrolysis receiving tank; [0026] (3) pumping the material in the alkali hydrolysis receiving tank into the alkali hydrolysis rectification column at a speed of 1 m.sup.3/h by the second feed pump, heating the material in the alkali hydrolysis rectification column by a second reboiler with temperature of 81° C. at the bottom of the alkali hydrolysis rectification column and temperature of 77.5° C. at the top of the alkali hydrolysis rectification column, condensing the material distilled from the rectification column by the second condenser and sending the material into the finished product tank, refluxing one part of the material in the finished product tank with a reflux ratio of 1.5, extracting qualified alcohol in the finished product tank after sampled and tested, and extracting the waste at the bottom of the alkali hydrolysis rectification column by the second extraction pump.

    [0027] After testing, the water content of the obtained ethanol is 0.8% and the impurity content is 3.1%.

    Embodiment Four

    [0028] A purification method using the device for distillation decolorization and purification of alcohol in maltol production comprises the following steps: [0029] (1) pumping crude alcohol into the rectification column at a speed of 1.5 m.sup.3/h by the first feed pump, heating the crude alcohol in the rectification column by the first reboiler with temperature of 87° C. at the bottom of the rectification column and temperature of 78° C. at the top of the rectification column, condensing the material distilled from the rectification column by the first condenser and sending the material into the reflux tank, refluxing one part of the material in the reflux tank and extracting the other part of the material into the alkali hydrolysis kettle with a reflux ratio of 0.6, and extracting the waste at the bottom of the rectification column by the first extraction pump; [0030] (2) adding caustic soda into the alkali hydrolysis kettle with amount of 25 kg caustic soda per 4 m.sup.3 material, increasing temperature up to 78° C., holding the temperature for 1 h to finish alkali hydrolysis, and sending the material into the alkali hydrolysis receiving tank; [0031] (3) pumping the material in the alkali hydrolysis receiving tank into the alkali hydrolysis rectification column at a speed of 1 m.sup.3/h by the second feed pump, heating the material in the alkali hydrolysis rectification column by a second reboiler with temperature of 82° C. at the bottom of the alkali hydrolysis rectification column and temperature of 78° C. at the top of the alkali hydrolysis rectification column, condensing the material distilled from the rectification column by the second condenser and sending the material into the finished product tank, refluxing one part of the material in the finished product tank with a reflux ratio of 1.5, extracting qualified alcohol in the finished product tank after sampled and tested, and extracting the waste at the bottom of the alkali hydrolysis rectification column by the second extraction pump.

    [0032] After testing, the water content of the obtained ethanol is 1.0% and the impurity content is 3.0%.

    [0033] The above described are only specific embodiments of the present application, under the above-mentioned teachings of the application, those skilled in the art can carry out other improvements or deformations on the basis of the above-mentioned embodiments. Those skilled in the art should understand that the above specific description is only to better explain the purpose of the present application, and the protection scope of the present application should be subject to the protection scope of the claims.

    [0034] Furthermore, those skilled in the art can understand that although some embodiments described herein include some features included in other embodiments but not others, the combination of features of different embodiments means that they are within the scope of the present application and form different embodiments. For example, in the following claims, anyone of the claimed embodiments may be used in any combination.