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Hyperfiltration-distillation integration process for reclaiming glycerin from low-concentration sweet water

A low-concentration, reverse osmosis technology, applied in the field of reverse osmosis-distillation integrated process, can solve the problems of wasting glycerin resources, environmental pollution, and difficulty in self-protection, and achieve the effects of large processing capacity, low energy consumption, and low cost

Inactive Publication Date: 2009-11-04
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The actual industrial operation shows that for sweet water with a glycerin content of not less than 5%, it can be profitable by adopting pretreatment, double-effect evaporation, distillation and other process routes to recover; but for sweet water with a glycerin content of less than 4%, it is difficult to adopt the above-mentioned process. Realize self-protection, so low-concentration sweet water with a glycerin content of less than 3% is mostly discharged directly in China, which not only wastes precious glycerin resources, but also causes serious pollution to the environment

Method used

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  • Hyperfiltration-distillation integration process for reclaiming glycerin from low-concentration sweet water
  • Hyperfiltration-distillation integration process for reclaiming glycerin from low-concentration sweet water

Examples

Experimental program
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Effect test

Embodiment 1

[0031]Take 100kg of acidic sweet water with a glycerin content of 1.1% (mass percentage, the same below), add quicklime to neutralize it to neutrality, then add polyferric sulfate, flocculate and settle and filter; the filtrate is passed through a plate cellulose acetate asymmetric membrane under a pressure of 1MPa The components are concentrated by reverse osmosis to obtain a concentrated liquid with a glycerin concentration of 1.4%. The concentrated liquid is evaporated to remove water and part of the salt to obtain crude glycerin; the crude glycerin is refined by vacuum distillation and mixed bed ion exchange resin column at an operating pressure of 2mmHg (201×7 type strongly basic styrene-based anion exchange resin and 001×7 type strongly acidic styrene-based cation exchange resin are mixed in a volume ratio of 1:2) and activated carbon are decolorized to obtain 0.88kg of glycerin product, with glycerin in the product The content of glycerin is 98.6%, and the recovery rate of ...

Embodiment 2

[0033] Take 100kg of acidic sweet water with 2.0% glycerin content, add sodium hydroxide solution to neutralize it, then add polyaluminum trichloride, flocculate and settle and filter; the filtrate is concentrated by reverse osmosis of plate polyamide composite membrane module under pressure of 2MPa A concentrated liquid with a glycerol concentration of 3.6% is obtained. The concentrated liquid is evaporated by three-effect evaporation to remove water and part of the salt to obtain crude glycerin; the crude glycerin is purified by vacuum distillation and mixed bed ion exchange resin column under the operating pressure of 4mmHg (201×7 Type strongly basic styrene-based anion exchange resin and 001×7 type strongly acidic styrene-based cation exchange resin at a volume ratio of 1:1) and activated carbon to obtain 1.74kg of glycerin product. The content of glycerin in the product is 98.7%. The recovery rate of glycerol is 85.9%.

Embodiment 3

[0035] Take 100kg of alkaline sweet water with 1.8% glycerin content, add sulfuric acid solution to neutralize it, then add alum, flocculate and settle and filter; the filtrate is concentrated by reverse osmosis of plate polybenzimidazolone membrane module under pressure of 3MPa to obtain glycerin Concentrated solution with a concentration of 4.4%. The concentrated solution is evaporated by double-effect evaporation to remove water and part of the salt to obtain crude glycerin; crude glycerin is purified by reduced pressure distillation and mixed bed ion exchange resin column at an operating pressure of 6mmHg (201×7 type strong Alkaline styrene-based anion exchange resin and 001×7 type strong acidic styrene-based cation exchange resin are mixed in a volume ratio of 2:1) and activated carbon are decolorized to obtain a glycerin product of 1.54kg. The content of glycerin in the product is 98.5%. The recovery rate was 84.3%.

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Abstract

The present invention discloses an integration technics with anti-penetration and distillation to recycle a glycerin in low-concentration sweet water. The steps for the present invention are as follows: (1) the pH value for the low-concentration sweet water is adjusted to litmusless by using of a neutralization agent, and then a flocculating agent is added into the sweet water; after being deposited, the mixture is to be filtered; (2) the filter liquid is condensed into a condensing liquid through an anti-penetration film component in the pressure of 1-8MPa; the condensing liquid is vaporized with multi-aspects to get rid of water and part of salt; and then a coarse glycerin; (3) the coarse glycerin is decompressed, distilled, ion-exchanged with resin refining in a mixing bed, and decolored with an active carbon to create the glycerin product with the purity more than 98.5 percent. The present invention can be used in medicine industry and foodstuff industry and so on. The technics has the advantages of low resource consumption, large treatment quantity and low cost and so on. The present invention can not only bring much better economical benefit by changing uselessness into usefulness, but also has greater environmental and social benefit.

Description

Technical field [0001] The invention relates to a reverse osmosis-distillation integrated process for recovering glycerin in low-concentration sweet water. Background technique [0002] Glycerin (glycerin, glycerine, glycerol), also known as glycerol, CAS No.: 56-81-5, molecular formula: C 3 H 8 O 3 , The molecular weight is 92.09. Glycerin is an important chemical raw material and has a wide range of applications in the organic chemical industry, polymer synthesis, daily chemicals, textiles, coatings, leather, tobacco, food and medicine. There are three main production methods for glycerol. One is the method of extracting glycerol from natural fats and oils, including saponification and oil hydrolysis; the second is to use sugars as raw materials to produce glycerol by microbial fermentation, that is, the fermentation method, which includes fermentation of raw materials such as molasses and starch; The third is to use petrochemical products as raw materials to synthesize glycero...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/22C07C29/74
CPCY02P20/10
Inventor 吕秀阳朱思佳陈欢林
Owner ZHEJIANG UNIV
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