Novel technique for producing methyl acetate

A technology of methyl acetate and new process is applied in the new process field of continuous production of methyl acetate, can solve the problems of high energy consumption, poor extraction effect, large amount of extraction agent, etc., and achieves the effect of reducing material consumption

Inactive Publication Date: 2013-05-22
谦信化工集团有限公司
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Problems solved by technology

However, the extraction effect of using water as the extraction agent is not good, and there are disadvantag...

Method used

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  • Novel technique for producing methyl acetate

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Embodiment 1

[0030] The new process for the production of methyl acetate described in Example 1, firstly carries out esterification reaction rectification, then carries out the removal of acetic esters, finally carries out methyl acetate rectification, and simultaneously carries out wastewater treatment to obtain methyl acetate finished product And by-products methanol and acetate, recycling by-products backflow continue to produce methyl acetate. The process includes the following steps:

[0031] (1) Esterification reaction rectification: the raw materials acetic acid and methanol are fed into the esterification tower reaction through the esterification reboiler at a molar ratio of 1:1.5; part of the products extracted from the middle of the esterification tower enter the esterification phase separator for separation Acetate esters and waste water are obtained by layering. The layered acetates are returned to the esterification tower, and the waste water enters the wastewater recovery tower;...

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Abstract

The invention discloses a novel technique for producing methyl acetate. Acetate is refluxed to carry residual excessive water in the esterifying kettle away in the industrial production process; and a continuous process, comprising reaction rectification, acetate recovery, methyl ester rectification, wastewater treatment and the like, is utilized to conveniently and efficiently prepare the high-purity methyl acetate. The method overcomes the defects of difficulty in separating and purifying the product methyl acetate in the process of producing methyl acetate by esterifying reaction of acetic acid and methanol. The technique has the advantages of low equipment requirement, low energy consumption and simple technique. The product prepared by the method is suitable for organic solvents, polyurethane foam foaming agents, thinners and the like required in the production process of resins, coatings, inks, paints, adhesives and leather.

Description

Technical field [0001] The invention relates to a new process for the production of methyl acetate, in particular to a new process for the continuous production of methyl acetate which is prepared by the direct esterification method of acetic acid and methanol, and uses an acetate as a water-carrying agent . Background technique [0002] Methyl acetate is mainly used in resins, coatings, inks, paints, adhesives, organic solvents required in the leather production process, polyurethane foam blowing agents, thinners, etc. Since the esterification of acetic acid and methanol is restricted by chemical equilibrium, and there are two lowest azeotropes of methyl acetate-methanol and methyl acetate-water in the material system, methyl acetate dissolves 24% in water at room temperature, and water in acetic acid The methyl ester dissolves 8%, which is difficult to separate. If 1% methanol is present, it is miscible with water. Therefore, the traditional production process of methyl aceta...

Claims

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Application Information

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IPC IPC(8): C07C69/14C07C67/08
Inventor 赵楚榜于冬娥廖瑜曹传海张浩宁谭代娣
Owner 谦信化工集团有限公司
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