A method of recovering phosphoric acid from process water includes directing a process water stream having a pH and a first concentration of phosphoric acid and at least one salt into a vessel, contacting the process water stream with a sorption agent in the vessel, the sorption agent adsorbing phosphoric acid from the process water, withdrawing a first effluent including a first concentration of the at least one salt and a second concentration of phosphoric acid from the vessel, and contacting the sorption agent including the phosphoric acid with water, at least a portion of the phosphoric acid desorbing from the ion exchange media into the water to form a second effluent having a third concentration of phosphoric acid.

A method of recovering phosphoric acid from process water includes directing a process water stream having a pH and a first concentration of phosphoric acid and at least one salt into a vessel, contacting the process water stream with a sorption agent in the vessel, the sorption agent adsorbing phosphoric acid from the process water, withdrawing a first effluent including a first concentration of the at least one salt and a second concentration of phosphoric acid from the vessel, and contacting the sorption agent including the phosphoric acid with water, at least a portion of the phosphoric acid desorbing from the ion exchange media into the water to form a second effluent having a third concentration of phosphoric acid.

The present invention relates to a method for purifying phosphoric acid from a mixture which comprises organic compounds and water. In particular the present invention relates to a method for purifying phosphoric acid from a a pulping slurry, containing or consisting of phosphoric acid, one or more organic compounds and water, comprising or consisting of the following steps: i) providing a mixture containing or consisting of phosphoric acid, one or more substance(s) S having at least one secondary carbon atom attached to an alkoxy group, one or more (further) organic compounds and water, and adjusting (if necessary) the molar ratio of phosphoric acid to the total of one or more substance(s) S, having at least one secondary carbon atom attached to an alkoxy group, in the mixture to be in the range of from 1:0.4 to 1:10, preferably to be in the range of approximately 1:0.6 to 1:4, especially preferably to be approximately 1:0.85 to 1:2, ii) heating the mixture to 25 C. or more until phase separation occurs, iii) removing the light phase, and iv) separating the phosphoric acid from the heavy phase.

The present invention relates to a method for purifying phosphoric acid from a mixture which comprises organic compounds and water. In particular the present invention relates to a method for purifying phosphoric acid from a a pulping slurry, containing or consisting of phosphoric acid, one or more organic compounds and water, comprising or consisting of the following steps: i) providing a mixture containing or consisting of phosphoric acid, one or more substance(s) S having at least one secondary carbon atom attached to an alkoxy group, one or more (further) organic compounds and water, and adjusting (if necessary) the molar ratio of phosphoric acid to the total of one or more substance(s) S, having at least one secondary carbon atom attached to an alkoxy group, in the mixture to be in the range of from 1:0.4 to 1:10, preferably to be in the range of approximately 1:0.6 to 1:4, especially preferably to be approximately 1:0.85 to 1:2, ii) heating the mixture to 25 C. or more until phase separation occurs, iii) removing the light phase, and iv) separating the phosphoric acid from the heavy phase.

A process to purify a compound comprising a suspension crystallization step and additionally comprises a layer crystallization step and a storage step of an intermediate product obtained from the layer crystallization step before to its further purification in the suspension crystallization step.

A process to purify a compound comprising a suspension crystallization step and additionally comprises a layer crystallization step and a storage step of an intermediate product obtained from the layer crystallization step before to its further purification in the suspension crystallization step.

The present invention relates to a method for purifying raw phosphoric acid by adding ashes originating from waste incineration plants, as well as calcium hydroxide and at least one sulfide, and by wet-chemical digestion for obtaining (producing) calcium sulfate, pure phosphoric acid, metal salt solution and/or calcium hydrogen phosphates (e.g. triple superphosphate).

The present invention relates to a method for purifying raw phosphoric acid by adding ashes originating from waste incineration plants, as well as calcium hydroxide and at least one sulfide, and by wet-chemical digestion for obtaining (producing) calcium sulfate, pure phosphoric acid, metal salt solution and/or calcium hydrogen phosphates (e.g. triple superphosphate).

A method of recovering phosphoric acid from process water includes directing a process water stream having a pH and a first concentration of phosphoric acid and at least one salt into a vessel, contacting the process water stream with a sorption agent in the vessel, the sorption agent adsorbing phosphoric acid from the process water, withdrawing a first effluent including a first concentration of the at least one salt and a second concentration of phosphoric acid from the vessel, and contacting the sorption agent including the phosphoric acid with water, at least a portion of the phosphoric acid desorbing from the ion exchange media into the water to form a second effluent having a third concentration of phosphoric acid.

A method of recovering phosphoric acid from process water includes directing a process water stream having a pH and a first concentration of phosphoric acid and at least one salt into a vessel, contacting the process water stream with a sorption agent in the vessel, the sorption agent adsorbing phosphoric acid from the process water, withdrawing a first effluent including a first concentration of the at least one salt and a second concentration of phosphoric acid from the vessel, and contacting the sorption agent including the phosphoric acid with water, at least a portion of the phosphoric acid desorbing from the ion exchange media into the water to form a second effluent having a third concentration of phosphoric acid.