What is described relates to cross-flow packing heat and mass transfer column vessels, where rectifying separation of liquid-vapor mixtures, distillation of liquid-vapor mixtures, and absorptive separation of liquid-vapor mixtures occur, and may be used in oil-refining, petrochemical, chemical, gas, food, and other industries. The proposed mass transfer column with cross flow of liquid and gas (vapor) phases includes shell, feed nozzle, distillate and residue withdrawal nozzles, nozzles of injection and withdrawal of auxiliary flows, cross-flow packing sections separated heightwise by horizontal baffles having, successively, in direction of gas (vapor) phase, in normal shell cross section, a window for gas (vapor) flowing on packing section inlet side and continuous area on packing section outlet side, which alternate on horizontal baffles neighboring by height, with liquid distributors between packing adjacent sections and above packing upper section, which consist of three successively mating parts: horizontal leaf, set of steps, and blind pocket.

An improvement which reduces the reflux requirement for a fractional distillation system of an alcohol production plant (40, 60, 70, 80). The improvement includes a mixing device (44) for combining a water/alcohol mixture having an enhanced alcohol content (50, 62, 72, 82) with the reflux liquid (16) in the absence of a vapor/liquid equilibrium interface to form a reflux mixture (56) for supply to the rectifier column (14). The mixture having an enhanced alcohol content may be sourced from a location along the rectifier-reflux vapor to liquid system flow path, or from another source.

The invention relates to a process for producing ethylene carbonate and/or ethylene glycol, which comprises the following steps: a) supplying an overhead absorber stream withdrawn from an absorber to a vapor-liquid separator to yield an aqueous bottoms stream and a recycle gas stream; b) supplying an aqueous process stream comprising one or more impurities to a distillation apparatus to yield an overhead impurities stream and a purified aqueous process stream, wherein the aqueous process stream supplied to the distillation apparatus comprises at least a portion of the aqueous bottoms stream withdrawn from the vapor-liquid separator, wherein the overhead impurities stream is supplied to a condenser and is cooled to a temperature in the range of from 5 to 95? C., wherein the cooled overhead impurities stream is split into a reflux stream which is recycled to the distillation apparatus and an overhead impurities stream; and further steps c) and d).

A method for recovering mono-ethylene glycol from a mixture feed comprising bio-derived diols is disclosed. The mixture feed comprises mono-ethylene glycol in an amount of at least 80 weight-% of the total weight of the mixture feed. The method comprises: providing the mixture feed into a distillation column, wherein a distillation process is carried out, wherein the distillation column comprises at least 80 theoretical stages and wherein the mixture feed is fed into the distillation column at a point, which is at a height of 5-20% of the total height of the distillation column as calculated from the top of the distillation column, wherein the total height of the distillation column is determined based on the number of theoretical stages, and wherein the distillation process is carried out with a reflux ratio of 20-200; and recovering mono-ethylene glycol. Further is disclosed a distillation arrangement.

A method of obtaining purified DMF from a mixture comprising DMF and hydrogen chloride (HCl) involving distillation is provided.

A method of obtaining purified DMF from a mixture comprising DMF and hydrogen chloride (HCl) involving distillation is provided.

The invention relates to cross-flow packing heat and mass transfer column vessels, where rectifying separation of liquid-vapour mixtures, distillation of liquid-vapour mixtures, and absorptive separation of liquid-vapour mixtures occur, and may be used in oil-refining, petrochemical, chemical, gas, food, and other industries.

The proposed mass transfer column with cross flow of liquid and gas (vapour) phases of PETON system includes a shell, a feed nozzle, distillate and residue withdrawal nozzles, nozzles of injection and withdrawal of auxiliary flows, cross-flow packing sections separated heightwise by horizontal baffles having, successively, in the direction of gas (vapour) phase, in the normal shell cross section, a window for gas (vapour) flowing on the packing section inlet side and a continuous area on the packing section outlet side, which alternate on the horizontal baffles neighbouring by height, with liquid distributors between the packing adjacent sections and above the packing upper section, which consist of three successively mating parts: a horizontal leaf, a set of steps, and a blind pocket.

The invention allows achieving the objective of development of a highly efficient mass transfer column that allows for a dramatic variation of the liquid phase flow rates, which ensures a considerable extension of the vessel stable operation range as well as the possibility to use the contact devices with a different number of flows in one vessel.

The present invention relates to a solvent recovery apparatus and a solvent recovery method, and the solvent recovery apparatus and method according to the present application can reduce the used amount of steam in a synthetic rubber production process, and can reduce the used amount of energy by recovering the waste heat discarded through a condenser.

This invention relates to a process for recovering a liquid product from a pyrolysis stream. The process comprises preheating a pyrolysis stream comprising a mixture of hydrocarbons; distilling the preheated pyrolysis stream in a distillation column to produce one or more streams including a top stream at the top of the distillation column; cooling the top stream withdrawn from the distillation column in a condenser; refluxing the stream that has exited the condenser in a reflux vessel; and withdrawing at least part of a liquid product from the bottom of the reflux vessel to recover a liquid naphtha or naphtha-like product. The invention also relates to various recovered liquid products produced from the process described herein. The invention also relates to an apparatus for recovering liquid products from a pyrolysis stream, comprising a preheater; a distillation column that does not contain a reboiler; a condenser; and a reflux vessel.

The invention relates to a process for the continuous production of acrylic acid, in the absence of organic solvent and in the absence of chemical treatment of the aldehydes, and without employing a dividing-wall column, from a gaseous reaction mixture comprising acrylic acid obtained by gas-phase oxidation of a precursor of acrylic acid.