Method for continuously producing D-lactate

A lactic acid ester and lactic acid technology, applied in the field of continuous production of D-lactate, can solve the problems of high impurity content, high corrosion resistance requirements, and difficult wastewater treatment, so as to achieve good product quality, reduce corrosion, reduce The effect of wastewater volume

Pending Publication Date: 2022-01-28
SHOUGUANG GOLDEN FAR EAST MODIFIED STARCH CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the production methods of lactic acid esters are mostly catalyzed by sulfuric acid, and the reaction process is mostly intermittent. There are high requirements for corrosion resistance of equipment, difficult wastewater treatment, solid waste generation, low purification yield or the use of toxic azeotropic reagent toluene, and the product is simple. Disadvantages such as high content and low light purity

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  • Method for continuously producing D-lactate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Such as figure 1 Shown, a kind of method of continuous production D-lactate, specifically:

[0036] 1. Use cation exchange resin to fill the guard column, and use macroporous resin to fill the fixed bed, then connect the guard column and the fixed bed.

[0037] The filling capacity of cation exchange resin in the guard column is 4.2m 3 ; The filling capacity of the macroporous resin in the fixed bed is 17.18m 3 .

[0038] The manufacturer of the cation exchange resin is Jiangsu Suqing Water Treatment Engineering Group Co., Ltd., and the model is SQ716.

[0039] The macroporous resin is acid macroporous resin D113, the manufacturer is Langfang Qingteng Thermal Insulation Building Materials Co., Ltd., and the particle size is 0.315-1.25mm.

[0040] The function of the guard column is to remove metal cations in the reaction materials and prolong the single-pass service life of the resin in the fixed bed. During the reaction process, the reactant lactic acid is mixed w...

Embodiment 2

[0057] Such as figure 1 Shown, a kind of method of continuous production D-lactate, specifically:

[0058] 1. Use cation exchange resin to fill the guard column, and use macroporous resin to fill the fixed bed, then connect the guard column and the fixed bed;

[0059] The filling capacity of cation exchange resin in the guard column is 4.2m 3 ; The filling capacity of the macroporous resin in the fixed bed is 17.18m 3 .

[0060] The manufacturer of the cation exchange resin is Ningbo Zhengguang Resin Co., Ltd., the model is C-180, and the macroporous resin is acidic macroporous resin HND-12, and the manufacturer is Jiangsu Nanda Catalyst Research Center, with a particle size of 0.315-1.25mm .

[0061] The function of the guard column is to remove metal cations in the reaction materials and prolong the single-pass service life of the resin in the fixed bed. During the reaction process, the reactant lactic acid is mixed with methanol and then enters the guard column to remo...

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Abstract

The invention discloses a method for continuously producing D-lactate. The method comprises the steps of esterification reaction, first-stage rectification, second-stage rectification, third-stage rectification, fourth-stage rectification and adsorption treatment, wherein in the esterification reaction, reactants D-lactic acid and alcohol are mixed and then enter a protection column to remove metal cations, then the mixture enters a fixed bed to be subjected to catalytic esterification, the filling material of the protection column is cation exchange resin, and the filling material of the fixed bed is acidic macroporous resin. According to the invention, the D-lactate prepared by the method is good in product quality, the light purity can reach 99.82%, the comprehensive yield of the product is more than 97.2%, the moisture content is as low as 0.01%, and the acidity is as low as 0.02%.

Description

technical field [0001] The invention relates to the technical field of lactate production, in particular to a method for continuously producing D-lactate. Background technique [0002] D-lactate is an important chiral intermediate, which is widely used in the fields of green and low-toxic pesticides. Common D-lactate includes D-methyl lactate, D-ethyl lactate, D-lactic acid Butyl ester etc. At present, the production methods of lactic acid esters are mostly catalyzed by sulfuric acid, and the reaction process is mostly intermittent. There are high requirements for corrosion resistance of equipment, difficult wastewater treatment, solid waste generation, low purification yield or the use of toxic azeotropic reagent toluene, and the product is simple. High content, low light purity and other shortcomings. Contents of the invention [0003] The invention provides a method for continuous production of D-lactate, through the continuous catalytic esterification of D-lactic aci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/08C07C67/48C07C69/68
CPCC07C67/08C07C67/48C07B2200/07C07C69/68
Inventor 吴泽华侯月会李航李一强孙家香伦学宁
Owner SHOUGUANG GOLDEN FAR EAST MODIFIED STARCH CO LTD
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