Resource treatment process of high-salt wastewater in carboxymethyl cellulose production

A technology of carboxymethyl cellulose and treatment process, which is applied in the field of high-salt and refractory organic wastewater, which can solve the problems of reaction principle and reaction substances without much change, achieve less difficulty in operation management, improve recovery rate, and avoid mutual interference Effect

Active Publication Date: 2017-02-22
JIANGNAN UNIV
View PDF5 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Water enzyme method and melting enzyme method are mostly used for production. Although the specific processes are different, the reaction principle and reaction substances have not changed much. In the production process, a large amount of organic solvent ethanol is used. The ethanol solution does not participate in the reaction, but it needs to be distilled. Recycling and recycling, however, during the distillation recovery process, a large amount of high-salt organic wastewater will be produced

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
  • Resource treatment process of high-salt wastewater in carboxymethyl cellulose production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0034] (1) Take 2L of waste water provided by a CMC manufacturer in Jiangsu. After measuring its solid content of 200g / L, add 1% diatomite to the waste water, and obtain a clearer filtrate by suction filtration, and control the vacuum degree to -0.08Mpa , Concentrate the filtrate under the condition of about 80°C, and filter the concentrate while it is hot. The filter cake is sodium chloride, and the purity is about 96%. The filtrate was collected for the second concentration.

[0035] (2) by step (1) processing gained filtrate is wherein the concentration of sodium glycolate is 227g / L after measuring, and this filtrate is-0.08Mpa in vacuum tightness, carry out secondary concentration under 80 ℃ of conditions, filter concentrated solution while hot, Glycolic acid concentration is 373g / L in the filtrate.

[0036] (3) The pH value of the filtrate obtained in step (2) is adjusted to 10 with sodium hydroxide, and sodium glycolate is crystallized by means of temperature programmin...

Embodiment approach 2

[0040] (1) Take 2L of waste water provided by a CMC manufacturer in Jiangsu. After measuring its solid content of 200g / L, add 1% diatomite to the waste water, and obtain a clearer filtrate by suction filtration, and control the vacuum degree to -0.08Mpa , Concentrate the filtrate under the condition of about 80°C, and filter the concentrate while it is hot. The filter cake is sodium chloride, and the purity is about 96%.

[0041] (2) The concentration of glycolic acid in the obtained filtrate from step (1) is 218g / L. Add hydrochloric acid to adjust the pH to 1, filter, add extractant to obtain aqueous phase and organic phase, and the organic phase is distilled under reduced pressure to recover and extract agent to obtain ethoxyacetic acid at the same time.

[0042](3) The aqueous phase obtained in step (2) was mixed with the aqueous phase in step (5) in embodiment 1, and the pH value was adjusted to 10 with sodium hydroxide, and the sodium glycolate was crystallized by means o...

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 recycling processing technology for high-salt wastewater during carboxymethyl cellulose production. The processing technology combines extraction and graded crystallization technologies. In the graded crystalization process, through multi-effect (or mechanical recompression) evaporation crystallization, crude salt is recovered from wastewater and condensate water is evaporated, the condensate water reaches the industrial reuse water standard, and refined salt is prepared from crude salt through washing; and then through cooling crystallization, sodium glycollate crystal is separated out, the crystallization mother liquid is used for a next crystallization process, so that closed cycle is realized. In the above graded crystallization process, ethoxyacetic acid is obtained by performing extraction separation on a concentrated liquid, and the viscosity is reduced. The method is simple in operation, low in cost and high in separation recovery rate. The whole processing technology employs closed cycle, has no pollutants, and is easy for industrialization. The technology helps to solve the high-salt wastewater processing problem in the carboxymethyl cellulose production process, also helps to realize the recycling processing purposes of turning harm into good and changing wastes into valuables, and has substantial economic, social and environment benefit.

Description

technical field [0001] The invention belongs to the technical field of high-salt wastewater treatment, and in particular relates to a treatment process for recycling useful components of high-salt refractory organic wastewater generated in the production process of carboxymethyl cellulose. Background technique [0002] Carboxymethylcellulose (CMC) is a thickener widely used in food and daily chemical products. The main raw materials of CMC are ethanol, chloroacetic acid and sodium hydroxide. Water enzyme method and melting enzyme method are mostly used for production. Although the specific processes are different, the reaction principle and reaction substances have not changed much. In the production process, a large amount of organic solvent ethanol is used. The ethanol solution does not participate in the reaction, but it needs to be distilled. Recycling and recycling, however, during the distillation recovery process, a large amount of high-salt organic wastewater will be...

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 Patents(China)
IPC IPC(8): C02F1/04C02F9/10C01D3/04C07C59/06C07C59/125C07C51/42C02F103/38
Inventor 陈建新
Owner JIANGNAN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap