Unlock instant, AI-driven research and patent intelligence for your innovation.

Method and equipment for recovering and purifying waste solvent ethanol-cyclohexane-piperazine

A purification method and cyclohexane technology, applied in chemical instruments and methods, distillation purification/separation, extraction purification/separation, etc., can solve the problems of environmental pollution, high purification difficulty, waste, etc., and reduce the pollution degree and yield. High and simple production process effect

Inactive Publication Date: 2021-09-17
四川熔增环保科技有限公司
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large amount of waste solvents containing ethanol, cyclohexane, piperazine, a small amount of water and trace pharmaceutical components are produced during production. Due to the high difficulty of purification, most of them are discarded and no longer used, resulting in great waste. After incineration or discharge, the environment will also cause harm. Great pollution

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and equipment for recovering and purifying waste solvent ethanol-cyclohexane-piperazine
  • Method and equipment for recovering and purifying waste solvent ethanol-cyclohexane-piperazine
  • Method and equipment for recovering and purifying waste solvent ethanol-cyclohexane-piperazine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041]Embodiment 1: by draining the waste water in the waste water tank 1 into the rectification separation tower 2, get the waste solvent containing 51% ethanol, 43% hexanaphthene, 5% piperazine, rectification, the condition of rectification is: The temperature at the bottom of the still is 110°C, the temperature of the liquid in the still is 109°C, the temperature at the top of the still is 62-77°C, and the reflux ratio is controlled at 5:1; ethanol, cyclohexane and a small amount of water are separated; piperazine is extracted from the tower, and after passing the test Packing in cans, filling with nitrogen gas for storage, to obtain anhydrous piperazine with a purity ≥ 99.5% (wt), and rectifying the waste water through a multi-stage rectification structure, adding 1.53 liters of waste solvent to the ethanol and cyclohexane obtained from the above rectification. Double the volume of water extraction, the upper layer is obtained cyclohexane, after the test is qualified, it is...

Embodiment 2

[0042] Embodiment 2: get waste solvent containing 56% ethanol, 35% hexanaphthene, 8% piperazine, rectification, the condition of rectification is: rectification still bottom temperature 110 ℃, liquid temperature 109 ℃ in still, still top temperature 62~77°C, control the reflux ratio 3:1; separate out ethanol, cyclohexane and a small amount of water; extract piperazine from the tower kettle, put it in a tank after passing the test, and store it with nitrogen gas, that is to say, the product with a purity of ≥99.5% (wt) Anhydrous piperazine, the ethanol and hexanaphthene that above-mentioned rectification obtains, add the water extraction of 0.18 times of volume of waste solvent, upper stratum obtains hexanaphthene, after passing the test, pack into a tank, store with nitrogen gas, that is, the purity is more than or equal to 99.5% (wt ) of industrial grade cyclohexane; the lower layer obtains an aqueous phase composed of ethanol and water, and distills the aqueous phase obtained...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method and equipment for recovering and purifying a waste solvent ethanol-cyclohexane-piperazine, which have the beneficial effects that components in the waste solvent ethanol-cyclohexane-piperazine are separated and water and various impurities are removed through a method of rectification separation, extraction separation, distillation separation and coupling membrane dehydration separation, and through a series of procedures with low energy consumption. the waste solvents of ethanol with the purity of only 50%-60% wt, cyclohexane with the purity of 30%-45% wt and piperazine with the purity of 3%-8% wt are purified into industrial-grade absolute ethanol with the purity of more than or equal to 99.9% wt, industrial-grade cyclohexane with the purity of more than or equal to 99.5% wt and absolute piperazine with the purity of more than or equal to 99.5% wt, so that recycling of the waste solvent ethanol-cyclohexane-piperazine is realized, the pollution degree of the waste solvents to the environment is reduced, and the purified solvent can be recycled, so that the production cost is saved. The purification method provided by the invention also has the advantages of high yield, low energy consumption, recyclability, simple and convenient production process, stable operation, suitability for industrial production and the like.

Description

technical field [0001] The invention relates to the technical field of recovery, purification and reuse of mixed solvents, in particular to a recovery and purification method and equipment for waste solvent ethanol-cyclohexane-piperazine. Background technique [0002] With the continuous development of the chemical industry, the application of related pharmaceutical raw materials and intermediates is becoming more and more common, ethanol, cyclohexane, and piperazine are widely used. A large amount of waste solvents containing ethanol, cyclohexane, piperazine, a small amount of water and trace pharmaceutical components are produced during production. Due to the high difficulty of purification, most of them are discarded and no longer used, resulting in great waste. After incineration or discharge, the environment will also cause harm. Great pollution. The purpose of the present invention is in order to overcome the deficiencies in the prior art, separate ethanol, hexanaphth...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/80C07C29/86C07C29/76C07C31/08C07C7/04C07C7/10C07C13/18C07D295/023C07D295/027
CPCC07C29/80C07C29/86C07C29/76C07C7/04C07C7/10C07D295/023C07D295/027C07C2601/14C07C31/08C07C13/18
Inventor 范文林纪王洋鲁加峰张怡
Owner 四川熔增环保科技有限公司