GB1006515A - - Google Patents

Info

Publication number
GB1006515A
GB1006515A GB3827662A GB3827662A GB1006515A GB 1006515 A GB1006515 A GB 1006515A GB 3827662 A GB3827662 A GB 3827662A GB 3827662 A GB3827662 A GB 3827662A GB 1006515 A GB1006515 A GB 1006515A
Authority
GB
United Kingdom
Prior art keywords
alkali
polysaccharide
etherification
amount
ether
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB3827662A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hercules Powder Co
Original Assignee
Hercules Powder Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hercules Powder Co filed Critical Hercules Powder Co
Publication of GB1006515A publication Critical patent/GB1006515A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B11/00—Preparation of cellulose ethers
    • C08B11/02—Alkyl or cycloalkyl ethers
    • C08B11/04—Alkyl or cycloalkyl ethers with substituted hydrocarbon radicals
    • C08B11/10—Alkyl or cycloalkyl ethers with substituted hydrocarbon radicals substituted with acid radicals
    • C08B11/12—Alkyl or cycloalkyl ethers with substituted hydrocarbon radicals substituted with acid radicals substituted with carboxylic radicals, e.g. carboxymethylcellulose [CMC]
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B1/00—Preparatory treatment of cellulose for making derivatives thereof, e.g. pre-treatment, pre-soaking, activation
    • C08B1/08—Alkali cellulose
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B11/00—Preparation of cellulose ethers
    • C08B11/02—Alkyl or cycloalkyl ethers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B11/00—Preparation of cellulose ethers
    • C08B11/02—Alkyl or cycloalkyl ethers
    • C08B11/04—Alkyl or cycloalkyl ethers with substituted hydrocarbon radicals
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B11/00—Preparation of cellulose ethers
    • C08B11/02—Alkyl or cycloalkyl ethers
    • C08B11/04—Alkyl or cycloalkyl ethers with substituted hydrocarbon radicals
    • C08B11/08—Alkyl or cycloalkyl ethers with substituted hydrocarbon radicals with hydroxylated hydrocarbon radicals; Esters, ethers, or acetals thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B11/00—Preparation of cellulose ethers
    • C08B11/02—Alkyl or cycloalkyl ethers
    • C08B11/04—Alkyl or cycloalkyl ethers with substituted hydrocarbon radicals
    • C08B11/14—Alkyl or cycloalkyl ethers with substituted hydrocarbon radicals with nitrogen-containing groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B11/00—Preparation of cellulose ethers
    • C08B11/193—Mixed ethers, i.e. ethers with two or more different etherifying groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B31/00—Preparation of derivatives of starch
    • C08B31/08—Ethers

Abstract

A process for preparing a polysaccharide ether wherein alkali is chemically consumed during etherification of the polysaccharide, the ether consisting of a starch or cellulose ether of highly uniform substitution and high salt tolerance, comprises contacting the polysaccharide with alkali to condition it for subsequent etherification, the amount of alkali in this step being substantially in excess of the amount required for the etherification, then reducing the amount of alkali and etherifying the alkali polysaccharide in the presence of such reduced amount of alkali, the reduced amount of alkali being from that required for etherification up to 10% in excess of that amount. The alkali content may be reduced after the alkali conditioning step but before addition of the ether ifying agent. Removal of the alkali, e.g. sodium hydroxide may be effected by washing, solvent extraction or by addition of an acid. The etherification may be carried out on a slurry of the polysaccharide in aqueous alkali and a diluent, e.g. a lower aliphatic alcohol, or the process may be carried out on polysaccharide in the dough or semi-dry state. The ethers prepared may be carboxyalkyl-; carboxyalkyl alkyl-; carboxyalkyl hydroxyalkyl-; alkyl-; sulphoalkyl- or phosphonoalkyl-ethers. In examples, a slurry of comminuted cellulose is aged with a mixture of aqueous sodium hydroxide and isopropyl alcohol for 2 hours at 15 DEG C., and the cellulose then etherified at 70 DEG C. by adding a mixture of monochloroacetic acid and isopropyl alcohol in presence of glacial acetic acid to reduce the alkali content. The resulting carboxymethyl cellulose is hardened in methanol.
GB3827662A 1961-11-30 1962-10-09 Expired GB1006515A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US15616961A 1961-11-30 1961-11-30

Publications (1)

Publication Number Publication Date
GB1006515A true GB1006515A (en) 1965-10-06

Family

ID=22558405

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3827662A Expired GB1006515A (en) 1961-11-30 1962-10-09

Country Status (2)

Country Link
GB (1) GB1006515A (en)
NL (1) NL138964B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3255026A1 (en) * 2016-06-10 2017-12-13 Shin-Etsu Chemical Co., Ltd. Method for preparing hydraulic composition
US11591721B2 (en) 2016-12-21 2023-02-28 Nippon Paper Industries Co., Ltd. Acid-type carboxymethylated cellulose nanofiber and production method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3255026A1 (en) * 2016-06-10 2017-12-13 Shin-Etsu Chemical Co., Ltd. Method for preparing hydraulic composition
US11591721B2 (en) 2016-12-21 2023-02-28 Nippon Paper Industries Co., Ltd. Acid-type carboxymethylated cellulose nanofiber and production method thereof

Also Published As

Publication number Publication date
NL286123A (en) 1965-02-10
NL138964B (en) 1973-05-15

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