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Ethanol recovery method

An ethanol and recovery tower technology, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve problems such as difficulty in ethanol recovery

Active Publication Date: 2017-12-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The invention provides a method for ethanol recovery, which mainly solves the difficult problem of ethanol recovery in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Water, ethanol, cumene mixture (stream 2) enters from the middle and lower part of the extraction tower T101, the extractant (stream 1) enters from the middle and upper part of the extraction tower T101, and the rectification section is between the extractant feed position and the top of the tower. The extraction section is between the extraction agent and the ethanol mixed liquid feed position, and the stripping section is between the ethanol mixed liquid feed position and the tower kettle, and the ethanol and cumene mixed liquid (stream 3) is obtained at the top of the tower, and the still liquid is the extraction Agent and water mixed solution (streamline 4); Streamline 3 removes ethanol recovery tower T102, and tower top obtains dehydrated alcohol (streamline 5), and still liquid is cumene (streamline 6); Streamline 4 removes solvent recovery tower T103, tower top Water (stream 7) is obtained, and the still liquid is the extractant (stream 8); stream 8 is cooled by t...

Embodiment 2

[0049] The theoretical plate number of the extraction tower is , the operating pressure is 0.08MPaA, and the temperature at the top of the tower is 73°C.

[0050] The theoretical plate number of the ethanol recovery tower is , the operating pressure is 0.08MPaA, and the temperature at the top of the tower is 72°C.

[0051] The number of theoretical plates of the solvent recovery tower is , the operating pressure is 0.08MPaA, and the temperature at the top of the tower is 92°C.

[0052] The solvent ratio was 0.80.

[0053] table 3

[0054]

[0055] The purity of the ethanol product is 99.47wt%, the recovery rate is 99.40%, and the energy consumption per unit product (reboiler load) is 6502MJ / t.

Embodiment 3

[0057] The theoretical plate number of the extraction tower is , the operating pressure is 0.18MPaA, and the tower top temperature is 95°C.

[0058] The theoretical plate number of the ethanol recovery tower is 0.18MPaA, and the temperature at the top of the tower is 94°C.

[0059] The number of theoretical plates of the solvent recovery tower is , the operating pressure is 0.18MPaA, and the temperature at the top of the tower is 96°C.

[0060] The solvent ratio was 0.86.

[0061] Table 4

[0062]

[0063] The purity of the ethanol product is 99.5wt%, the recovery rate is 99.32%, and the unit product energy consumption (reboiler load) is 8312MJ / t.

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Abstract

The invention relates to a process for recovering ethanol from solvents in the crystallization process of dicumyl peroxide, and mainly solves the problem of difficult recovery of ethanol in the prior art. The present invention separates water from ethanol and cumene by adding an extractant, then separates ethanol and cumene to obtain absolute ethanol, and simultaneously separates water from the extractant and recycles the extractant to solve this problem. It can be used in the process production of dicumyl peroxide.

Description

technical field [0001] The present invention relates to a kind of ethanol recovery method, specifically, the solvent recovery ethanol process after dicumyl peroxide crystallization (using ethanol as solvent). Background technique [0002] Dicumyl peroxide (Dicumyl Peroxide, referred to as DCP) is mainly used as a vulcanizing agent for natural rubber and synthetic rubber, as an initiator for polymerization reactions, and as a crosslinking agent for polyethylene resins. [0003] DCP is obtained by reduction and condensation of cumene hydroperoxide: ① use sodium sulfite to reduce cumene hydroperoxide to benzyl alcohol at 62-65 ° C; ② in the presence of perchloric acid catalyst, make benzyl alcohol and peroxide Cumene hydrogen oxide is condensed at 42-45°C to obtain dicumyl peroxide condensation liquid; ③ After washing with 10% sodium hydroxide solution, vacuum distillation and concentration, then dissolve in absolute ethanol and crystallize below 0°C , filter and dry to obtain...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/08C07C29/84
Inventor 胡松杨卫胜金国杰
Owner CHINA PETROLEUM & CHEM CORP
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