System and method for preparing high-purity methyl lactate by direct esterification method

A technology of methyl lactate and lactic acid, which is applied in the field of direct esterification to prepare high-purity methyl lactate, can solve the problems of low product purity and complex methyl lactate process, achieve low polymerization degree, improve the single-pass conversion rate of lactic acid, and not easily The effect of corrosion

Pending Publication Date: 2021-10-22
EAST CHINA ENG SCI & TECH +1
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Problems solved by technology

[0005] The purpose of the present invention is to provide a system and method for preparing high-purity methyl lactate by direct esterification in view of the problems of complicated process and low product purity in the production process of methyl lactate in the prior art

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  • System and method for preparing high-purity methyl lactate by direct esterification method
  • System and method for preparing high-purity methyl lactate by direct esterification method

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Embodiment 1

[0038] See figure 1 , the raw material lactic acid content from the tank farm is 72.03%, and the water content is 17.07%, and it is injected into the lactic acid pretreatment tower 11 for vacuum distillation. The total plate number of the lactic acid pretreatment tower 11 is 20, and the tower pressure is set at 5kPa , the reflux ratio was 0.5, and the temperature of the tower kettle was set at 110°C. The steam rising from the top of the tower is condensed by the condenser 51 and enters the reflux tank 23. Part of the material flows back into the tower, and the other part of water is extracted. The acid content of the treated lactic acid rises to 85.12%, and the water content drops to 2.00%.

[0039] The material extracted from the tower kettle is pumped into the reactant mixing tank 21 through the first pump 32 and mixed with methanol. The molar ratio of methanol to dehydrated lactic acid is 4:1. The esterification reaction takes place in the bed reactor 71, and the residence...

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Abstract

The invention belongs to the technical field of methyl lactate, and particularly relates to a system and a method for preparing high-purity methyl lactate by a direct esterification method. The system comprises a lactic acid pretreatment tower, a mixing tank, a fixed bed reactor, a neutralization tank, a methanol recovery tower, a dehydration tower, a crude product tower and a product refining tower which are sequentially connected in series; and the specific working steps of the system comprise dehydration, esterification, neutralization and purification, the esterification reaction process is achieved through a fixed bed technology, ion exchange resin HND-8 is adopted as a catalyst in the esterification step, and compared with a traditional sulfuric acid catalyst, the ion exchange resin HND-8 is friendly to equipment and not prone to causing corrosion. Therefore, the methyl lactate product is directly prepared through the continuous synthesis process, the purity of the methyl lactate product reaches up to 99.95% or above, and compared with an existing intermittent process and two-step method for preparing the methyl lactate product, the technological process is simple and easy to operate, and the obtained product is higher in purity and has higher market value.

Description

technical field [0001] The invention belongs to the technical field of methyl lactate, in particular to a system and method for preparing high-purity methyl lactate by direct esterification. Background technique [0002] Methyl lactate is a kind of biodegradable and non-toxic solvent, which has great ability to replace some traditional solvents. As a cleaning agent, methyl lactate has the advantages of low loss, good economy, no adverse effect on the object to be cleaned, non-toxic, and easy biodegradation. It is a new type of alternative cleaning agent for ODS solvent-based cleaning agents. It is used in the electronics industry. has been widely used. Methyl lactate can be used to clean various optical discs, liquid crystal displays, magnetic heads, chips, circuit board substrates, and modules, and can also be used to clean optical lenses, printing screens, inks, and metals. It has great development value and application prospects. Green Solvents". [0003] The synthesis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/08C07C67/48C07C67/54C07C67/60C07C69/68C07C51/44C07C59/08
CPCC07C67/08C07C67/48C07C67/54C07C67/60C07C51/44C07C69/68C07C59/08
Inventor 钱贵菊邱挺刘征黄智贤钱俊叶长燊喻军王红星
Owner EAST CHINA ENG SCI & TECH
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