Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for recycling ethoxyacetic acid from sodium carboxymethylcellulose industrial wastewater

A technology of sodium carboxymethylcellulose and ethoxyacetic acid, which is applied in the separation/purification of carboxylic acid compounds, preparation of carboxylate salts, chemical instruments and methods, etc., can solve the problems of less reporting and achieve recycling and reuse , low cost and easy operation

Active Publication Date: 2014-11-12
SHANGHAI UNIV OF ENG SCI +1
View PDF3 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is found through literature research that the method of recovering ethoxyacetic acid from sodium carboxymethylcellulose production wastewater is rarely reported.

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Accurately pipette 200ml of sodium carboxymethylcellulose production wastewater, adjust the pH value of the wastewater to 12.0 with sodium hydroxide, and then distill the wastewater to remove ethanol and water in the wastewater at a pressure of 1KPa and a temperature of 70°C; use 30ml of the obtained white solid Mass percent concentration is 37% concentrated hydrochloric acid rinsing, and the hydrochloric acid solution that rinsing gets off is extracted 3 times with ethyl acetate, uses 120ml ethyl acetate each time; Collect the ethyl acetate organic phase after extraction, under 1KPa pressure, temperature Ethoxyacetic acid product is obtained by distillation at 50°C.

Embodiment 2

[0016] Accurately pipette 200ml of sodium carboxymethylcellulose production wastewater, adjust the pH value of the wastewater to 11.0 with sodium hydroxide, and then distill the wastewater to remove ethanol and water in the wastewater at a pressure of 1KPa and a temperature of 60°C; use 30ml of the obtained white solid Mass percent concentration is 36% concentrated hydrochloric acid rinsing, and the hydrochloric acid solution that rinsing comes off is extracted 3 times with butyl acetate, uses 200ml butyl acetate each time; Collect the butyl acetate organic phase after extraction, under 1KPa pressure, temperature Ethoxyacetic acid product is obtained by distillation at 60°C.

Embodiment 3

[0018] Accurately pipette 200ml of sodium carboxymethylcellulose production wastewater, adjust the pH value of the wastewater to 11.5 with sodium hydroxide, then distill the wastewater at a pressure of 1KPa and a temperature of 50°C to remove ethanol and water in the wastewater; use 30ml of white solid Concentrated hydrochloric acid with a mass percentage concentration of 38% is rinsed, and the rinsed hydrochloric acid solution is extracted with ether three times, using 150ml of ether each time; the extracted ether organic phase is collected and distilled at a pressure of 1KPa and a temperature of 70°C to obtain Ethoxyacetic acid products.

[0019] The product identification results are as follows:

[0020] 1 HNMR (CDCl 3 , δ / ppm): 1.25-1.3 (t, 3H), 3.6-3.65 (q, 2H), 4.13 (s, 2H), 8.1-8.2 (br, 1H).

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

A method for recycling ethoxyacetic acid from sodium carboxymethylcellulose industrial wastewater comprises the following steps that (1), the pH value of the sodium carboxymethylcellulose industrial wastewater is adjusted to 11.0-12.0, and then the wastewater is subjected to decompression and distillation to obtain a white solid; (2) the white solid obtained in the step (1) is eluted by concentrated hydrochloric acid, the obtained hydrochloric acid solution is extracted for 3 times by an organic solvent, and organic phases are separated out for standby application; (3), the organic phases obtained in the step (2) are subjected to decompression and distillation to obtain ethoxyacetic acid products. According to the method for recycling the ethoxyacetic acid from the sodium carboxymethylcellulose industrial wastewater, operation is convenient, the cost is low, and recycling and reusing of resources are achieved.

Description

technical field [0001] The invention relates to a method for recovering chemical products from chemical waste water, in particular to a method for recovering ethoxyacetic acid from waste water produced by sodium carboxymethyl cellulose. Background technique [0002] Carboxymethyl cellulose and its sodium salt are a class of stabilizers widely used in petroleum and food industries. Due to the existence of side reactions in the synthesis process of sodium carboxymethyl cellulose, the production wastewater contains a large amount of organic and inorganic by-products. Among them, ethoxyacetic acid is a major by-product. However, it is found through literature research that the method of recovering ethoxyacetic acid from the waste water produced by sodium carboxymethyl cellulose is rarely reported. Contents of the invention [0003] Purpose of the present invention, just in order to solve the problems referred to above, a kind of method of reclaiming ethoxyacetic acid from so...

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
IPC IPC(8): C07C51/42C07C51/48C07C59/125C02F9/10
CPCC07C51/02C07C51/42C07C59/125
Inventor 饶品华万志钢朱宏彬张文启倪志青
Owner SHANGHAI UNIV OF ENG SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com