Technical process of preparing high-purity L-lactic acid

A process method and high-purity technology, applied in the refining field of high-purity L-lactic acid, can solve the problems of excessive impurities, reduced distillation efficiency and productivity, and inability to achieve, optimize short-path distillation technology, improve extraction yield, and recover Take advantage of convenient effects

Active Publication Date: 2007-08-01
马鞍山同杰良生物材料有限公司
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  • Summary
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the application of domestic short-path distillation equipment on L-lactic acid is still in the trial stage, and there are still deficiencies in the purification effect, product grade and purification yield of L-lactic acid in terms of process technology scheme and short-path distillation equipment, especially to obtain high-purity polymerization Grade L-lactic acid also needs high yield, which cannot be achieved by the current general short-path distillation method.
[0005] In the current general short-path distillation process, crude lactic acid is used a

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1 (three-stage short-path distillation)

[0032]Send 50 liters of the decolorized and separated L-lactic acid (content 60%) solution into a thin-film concentration evaporator, and carry out decompression concentration under the conditions of a vacuum of 0.8-0.9Mpa and a temperature of 70°C to obtain L-lactic acid The solution was concentrated to 95%. Through the method of vacuum suction, the feed liquid is sucked into the feed tank, kept at 60-70°C, and at a flow rate of 6 liters / hour, it enters the first-stage short-path distiller with an evaporation area of ​​0.1M2. Under the conditions of 400Pa and jacket temperature of 80°C, the chromaticity of the primary heavy component product is 220 AAPHA, the water collected in the cold trap is 1.2 liters (acid content 10%), the chromaticity of the light component is 20 APHA, and the L-lactic acid content is 99 %, the collection volume is 0.3 liters. The primary heavy component material is sent into the secondary s...

Embodiment 2

[0035] Embodiment 2 (secondary short path distillation)

[0036] Send 100 liters of L-lactic acid (content 30%) solution after membrane treatment into a thin-film concentration evaporator, and carry out decompression concentration under the condition of vacuum degree of 0.8-0.9Mpa and temperature of 70°C, to L-lactic acid solution Concentrated to 95%. Through the method of vacuum suction, the feed liquid is sucked into the feed tank, kept at 60-70°C, and at a flow rate of 6 liters / hour, it enters the first-stage short-path distiller with an evaporation area of ​​0.1M2. Under the conditions of 400Pa and jacket temperature of 70°C, the chromaticity of the primary heavy component product is 1500 AAPHA, the water collected in the cold trap is 1.2 liters (acid content 10%), the chromaticity of the light component is 15 APHA, and the L-lactic acid content is 99 %, the collection volume is 0.3 liters. The primary heavy component material is sent into the secondary short path distil...

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Abstract

The invention discloses a making method of high-purity L-lactic acid, which comprises the following steps: a) extracting; crystallizing; decoloring; proceeding ion exchange or film separation; transmitting predisposed L-lactic acid into condenser under 0.5-0.95Mpa at 50-90 deg.c to condensate; b) transmitting L-lactic acid into at least two-grade cascading short-path distill devices to distill; setting one-grade short-path under 50-500Pa at 50-130 deg.c to distill; transmitting the heavy component into two-grade short-path distill device; collecting light component to obtain high-purity L-lactic acid; distilling heavy component from two-grade short-path distill device under 10-500Pa at 100-120 deg.c to distill; collecting light component as high-purity product.

Description

technical field [0001] The invention belongs to the refining field of high-purity L-lactic acid, and mainly relates to the L-lactic acid product obtained from L-lactic acid produced by a fermentation method through a series of extraction processes, through concentration and short-range refining, to obtain high-purity polymerization-grade L-lactic acid. It can be used as a raw material for direct polycondensation to produce polylactic acid. Background technique [0002] L-lactic acid is an important organic acid, which has broad application prospects in food, beverage, feed, modern medicine, modern pesticide, daily chemical industry, papermaking and electronics industries. In recent years, people have used L-lactic acid as a raw material to make a new biodegradable environmentally friendly material - polylactic acid (PLA). The development of this technology has made L-lactic acid products attract people's attention, and has become one of the most popular biochemical products...

Claims

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Application Information

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IPC IPC(8): C07C51/42C07C59/08
Inventor 劳含章孙建荣王健钱志良
Owner 马鞍山同杰良生物材料有限公司
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