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Method for separating and recovering ethyl acetate and methanol

An ethyl acetate, separation and recovery technology, applied in the preparation of carboxylate, chemical instruments and methods, separation/purification of carboxylate, etc., can solve the problem of difficult process operation, increased rectification throughput and poor product quality and other problems, to achieve the effect of low cost, reduced emissions and high product quality

Inactive Publication Date: 2012-10-24
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantages of this method are: ①After the ethyl acetate and methanol waste liquid is washed with water, the rectification treatment capacity will increase, and the energy consumption will be high; , the process operation difficulty is big 3. what reclaim and obtain is the azeotrope of ethyl acetate and ethyl acetate and methanol, wherein the product quality of ethyl acetate is poor, and the azeotrope of ethyl acetate and methanol also needs further processing and can further use

Method used

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Examples

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Embodiment 1

[0026] A method for separating and recovering ethyl acetate and methyl alcohol, its concrete steps are as follows:

[0027] (1) Preparation of salting-out agent

[0028] According to the ratio of the mass (g) of inorganic salt: the volume (ml) of water is the ratio of 1: 1.5, calcium chloride is added into water, stir until dissolving, just be mixed with the salting-out agent that mass fraction is 40%.

[0029] (2) separation and recovery of ethyl acetate

[0030] After the (1) step is completed, the industrial waste liquid containing ethyl acetate and methanol is used as raw material. Firstly, the raw material is pretreated, that is, adding high-purity ethyl acetate to the industrial waste liquid to adjust the volume ratio of ethyl acetate and methanol in the waste liquid to 1:0.375, and then salting out according to the preparation of step (1). Agent: the volume ratio of the raw material after pretreatment is the ratio of 1: 3.5, in the raw material after pretreatment, add...

Embodiment 2

[0036] A method for separating and recovering ethyl acetate and methyl alcohol, with embodiment 1, wherein:

[0037] In the (1) step, the quality (g) of inorganic salt: the ratio of the volume (ml) of water is 1: 9, is mixed with the salting-out agent that mass fraction is 10%, and inorganic salt is sodium chloride.

[0038] In the (2) step, the volume ratio of ethyl acetate and methyl alcohol in the adjustment waste liquid is 1: 0.1, the salting-out agent of (1) step preparation: the volume ratio of the raw material after pretreatment is the ratio of 1: 2 , for the first time to stand for stratification for 15 minutes, the mass (g) of anhydrous calcium chloride: the ratio of the volume (ml) of the upper light phase collected for the first time was 1: 8, and for the second time to stand for stratification for 30 minutes Minutes, the temperature at the top of the distillation tower was 77°C.

[0039] In the (3) step, the first time and the second time lower phase that (2) step...

Embodiment 3

[0042] A method for separating and recovering ethyl acetate and methyl alcohol, with embodiment 1, wherein:

[0043] In the (1) step, the quality (g) of inorganic salt: the ratio of the volume (ml) of water is 1: 1, is mixed with the salting-out agent that mass fraction is 50%, and inorganic salt is potassium acetate.

[0044] In the (2) step, the volume ratio of ethyl acetate and methyl alcohol in the adjustment waste liquid is 1: 0.4, the salting-out agent of (1) step preparation: the volume ratio of the raw material after pretreatment is the ratio of 1: 5 , for the first time to stand for stratification for 15 minutes, the mass (g) of anhydrous calcium chloride: the ratio of the volume (ml) of the upper light phase collected for the first time was 1: 5, and for the second time to stand for stratification for 60 minutes Minutes, the temperature at the top of the distillation tower was 90°C.

[0045] In the (3) step, the lower phase that (2) step finally merges first time an...

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Abstract

A method for separating and recovering ethyl acetate and methanol belongs to the field of separation and recovery technology of industrial effluent. Industrial effluent containing ethyl acetate and methanol are used as raw materials by the method. Two kinds of products of ethyl acetate and methanol are obtained through the preparation of salting-out agent and simple processes of separating and recovering ethyl acetate and methanol respectively. The method provided by the invention can fully utilize the industrial waste resource and is conducive to environmental protection. The method is easy in operation, safe, low in energy consumption, low in cost and convenient for application. The purity of two kinds of products of ethyl acetate and methanol all reach up to more than 99%. And the yield is also up to more than 95%. The method can be applied in the separation and recovery of industrial effluent containing ethyl acetate and methanol, and is ideal green production technology of energy saving and environmental protection.

Description

technical field [0001] The invention belongs to the technical field of separation, recovery and utilization of industrial waste liquid, and in particular relates to a method for separation, recovery and utilization of industrial waste liquid containing ethyl acetate and methanol Background technique [0002] Ethyl acetate is a fine chemical product with a wide range of uses, mainly used in the production process of cellulose acetate, ethyl cellulose, chlorinated rubber, vinyl resin, cellulose acetate resin, synthetic rubber, coatings and paints. Specifically reflected in the following aspects: as an industrial solvent, used in coatings, adhesives, ethyl cellulose, artificial leather, linoleum colorants, artificial fibers and other products; as a binder, used in printing inks, artificial pearls Production; as an extractant, used in the production of medicines, organic acids and other products; as a raw material for spices, it is used as the main raw material for fruit flavors...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/14C07C67/48C07C67/62C07C31/04C07C29/84
Inventor 谭世语罗自萍陈红梅张红晶李伟傅英杰贺兴孙龙艳
Owner CHONGQING UNIV
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