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Method for recovering ethanol in analginum production

Analgin and ethanol technology, applied in the field of pervaporation membrane applications, can solve the problems of easy introduction of the third component into the product, large amount of the third component, and large equipment footprint, so as to improve energy utilization and save Reagent consumption and the effect of less equipment footprint

Active Publication Date: 2014-10-22
JIANGSU NINE HEAVEN HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, the recovery method of ethanol in the production of Analgin mostly adopts extraction and rectification with salt addition. Generally, ethylene glycol is used as the extraction agent. Extraction and rectification with salt addition is a double-tower process. The steam consumption is large, the equipment occupies a large area, and the environment is polluted. Serious, and the product is easy to introduce the third component, resulting in low product purity, large amount of third component and high recovery cost

Method used

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  • Method for recovering ethanol in analginum production
  • Method for recovering ethanol in analginum production
  • Method for recovering ethanol in analginum production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] When using different membrane materials, the obtained data such as recovered ethanol, permeate, and flux are shown in Table 1.

[0045] Table 1

[0046]

[0047] It can be seen from the table that the molecular sieve membrane is particularly suitable for the dehydration treatment of recovered ethanol, and the obtained treatment capacity and permeation flux are better than other types of membrane materials, and the water content of the permeate is also better than other several membrane materials.

[0048]

[0049] Example 2

Embodiment 2

[0051] When using different concentration percentages, the obtained data such as recovered ethanol, permeate, and flux are shown in Table 2.

[0052] Table 2

[0053]

[0054] It can be seen from the table that when the concentration ratio of the still is controlled in an appropriate range, the impurities in the mother liquor can be effectively entered into the steam, and the water flux and the purity of recovered ethanol can be improved.

[0055]

[0056] Example 3

Embodiment 3

[0058]

[0059] Example 4

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Abstract

The invention relates to a method for recovering ethanol in analginum production, which comprises the following steps: filtering and crystallizing mother liquor obtained during an analginum condensation reaction process, distilling and concentrating; washing a concentrate through ethanol and centrifuging, then returning to a condensation reaction vessel, sending waste ethanol in a distillation column, condensing the products at top of the distillation column and then entering into an intermediate tank; evaporating an ethanol solution through distillation and recovery and then entering into a pervaporation membrane separation machine set for dehydrating, obtaining ethanol with high purity in the pervaporation membrane separation machine set, returning the ethanol as a solvent to the analginum condensation reaction process for cycle usage; connecting the pervaporation membrane separation machine set and a vacuum system, passing water and a few of ethanol in the solution through a pervaporation membrane, and then condensing penetrating fluid and then returning to the distillation column. During the recovery process, no other waste except water can be discharged, recovery rate is high, process is simple, energy utilization rate is high, and no third component is added.

Description

[0001] technical field [0002] The invention relates to a method for recovering ethanol in analgin production, in particular to a method for recovering ethanol in analgin production by a pervaporation method, which belongs to the field of pervaporation membrane applications. [0003] Background technique [0004] Analgin is a pyrazolone antipyretic and analgesic drug, which has significant antipyretic, analgesic, anti-inflammatory and anti-rheumatic effects, and is widely used for fever, acute arthritis, headache, rheumatic pain, neuralgia, dysmenorrhea, toothache and Treatment of muscle pain and other diseases. [0005] In the Sulpyrine condensation reaction section, the raw material 4-methylaminoantipyrine is dissolved in ethanol, and then sodium metabisulfite, sodium carbonate, activated carbon and formaldehyde are added. After the condensation reaction, the feed liquid enters the crystallization tank for crystallization to obtain the Sulpyrine finished product , the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/80C07C29/76C07C31/08
CPCC07C29/76C07C31/08Y02P20/10Y02P20/50
Inventor 余从立张传恒顾学红庆祖森
Owner JIANGSU NINE HEAVEN HIGH TECH
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