Title:
METHOD FOR PREPARING HYDROXYETHYL CELLULOSE
Document Type and Number:
WIPO Patent Application WO/2020/239012
Kind Code:
A1
Abstract:
Disclosed is a method for preparing hydroxyethyl cellulose. The method for preparing hydroxyethyl cellulose comprises a process of subjecting a cellulose raw material to alkalization, etherification, pH adjustment, washing and desalination, and solid–liquid separation to obtain hydroxyethyl cellulose, and also comprises the step of adding a precipitant before washing and desalination, and/or also comprises the step of adding a crosslinker between pH adjustment and washing and desalination. The method for preparing hydroxyethyl cellulose inhibits the dissolution and/or delays the dissolution of hydroxyethyl cellulose in water, achieves washing and desalination, and ensures the quality of the product; in comparison with conventional production processes, the washing liquid does not use organic solvents, there is no washing solvent recovery process step, production costs are significantly reduced, and the safety hazards and occupational health risks caused by the use of organic solvents are reduced; furthermore, the washing efficiency is high, one wash can achieve the objective of washing, saving washing time and improving production efficiency.
Inventors:
TENG KUN (CN)
LI QINGHUA (CN)
LIU TAO (CN)
LI CHANGYIN (CN)
TENG BO (CN)
ZHANG YAN (CN)
LI QINGHUA (CN)
LIU TAO (CN)
LI CHANGYIN (CN)
TENG BO (CN)
ZHANG YAN (CN)
Application Number:
PCT/CN2020/092884
Publication Date:
December 03, 2020
Filing Date:
May 28, 2020
Export Citation:
Assignee:
SHANDONG ETON NEW MAT CO LTD (CN)
International Classes:
C08B11/08
Foreign References:
| CN110156898A | 2019-08-23 | |||
| CN108424465A | 2018-08-21 | |||
| US3527751A | 1970-09-08 | |||
| CN108084271A | 2018-05-29 | |||
| KR20170076937A | 2017-07-05 | |||
| CN102492044A | 2012-06-13 |
Attorney, Agent or Firm:
BEIJING JUNHUI INTELLECTUAL PROPERTY AGENT OFFICE (ORDINARY PARTNERSHIP) (CN)
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