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Method for extraction-removing of low alcohol(s) from carboxylic ester product

A technology of lower alcohols and carboxylic acid esters, which is applied in the field of extraction and removal of lower alcohols, can solve the problems of unsatisfactory economical efficiency and mixing, and achieve the effects of reducing energy consumption and improving yield and purity

Inactive Publication Date: 2007-11-07
SOLVAY ZHANGJIAGANG SPECIALTY CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since MMA is slightly soluble in methanol solution, and methanol is also slightly soluble in MMA, water is inevitably mixed in the ester system, and finally the water in MMA must be removed to obtain a product with higher purity. This makes it less economical

Method used

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  • Method for extraction-removing of low alcohol(s) from carboxylic ester product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Preparation of Me a Y b

[0020] In a 500ml beaker, mix 50 grams of powdered KBr with 250 grams of MgSO 4 ·7H 2 O and 50 g MgCl 2 mix. Add 10 grams of water, mix and grind, and dry in a far-infrared oven at 120°C. A gray mass A was obtained.

Embodiment 2

[0022] Preparation of Me a Y b

[0023] In a 500ml beaker, the powdered NaNO 2 100 g vs. 150 g MgSO 4 ·7H 2 O and 246 g CaCl 2 mix. Add 10 grams of water, mix and grind, and dry in a far-infrared oven at 120°C. A gray mass B was obtained.

Embodiment 3

[0025] use me a Y b Removal of Methanol from MMA

[0026] The block A prepared in Example 1 is added into its inner chamber from the top of the extraction tower shown in Figure 1, a porous plate 4 is arranged in the inner cavity of the extraction tower, and the block A is placed on On the perforated plate 4, the stacking height of the general block A should be about 50cm lower than the height of the outlet 3, and then close the top cover 1 after putting it away; the MMA that will contain 5% methyl alcohol enters the inner cavity of the extraction tower from the inlet 2, and Slowly flow upwards through the perforated plate 4 and block A, and finally flow out the MMA that removes methanol from the outlet 3 on the top of the column, and contain Me a Y b The methanol solution flows out through the bottom 5 of the tower. After this process finished, the methanol content in the MMA measured by liquid chromatography was 0.01%.

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Abstract

The invention discloses an extraction process for removing lower alcohol from carboxylic ester, which has low energy consumption, without forming by-product, particularly no more new impurities are introduced. It is characterized by under certain temperature T, passing the mixture of carboxylic ester and lower alcohol through the extraction unit and reverse contacting with a solution of crystal or salt containing at least one of MeaYb, finally removing lower alcohol in the mixture effectively. Wherein, Me is ions of alkali metals and alkaline-earth metals, Y is nitrate radical, hydro-chloric acid radical, sulfuric acid radical, hydro-bromic acid radical, a and b is the integer of valences state of representing elements.

Description

technical field [0001] The invention relates to a method for extracting and removing lower alcohols in carboxylic acid esters. Background technique [0002] Carboxylates are widely used in industry, such as: (meth)acrylates are starting compounds for the preparation of polymers and copolymers of fibers, plastics, surface coatings, dispersions or debonding agents. Usually, carboxylate can be obtained by esterification reaction, such as: fatty acid methyl ester, methyl (meth)acrylate, etc. can be obtained by esterification reaction, but in this production process, excess methanol is usually used As a reaction raw material, therefore, after the reaction, methanol must be removed from the reaction mixture to improve the yield and purity of the product. In addition, carboxylic acid esters such as fatty acid methyl ester and (meth) acrylate are often used as raw materials to produce other required types of carboxylic acid esters. In this process, methanol or ethanol will be produ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C67/48C07C69/54C07C69/00
Inventor 王玮李胜兵许文洁
Owner SOLVAY ZHANGJIAGANG SPECIALTY CHEM