AU593325B2 – A process for the dry cationization of starch
– Google Patents
AU593325B2 – A process for the dry cationization of starch
– Google Patents
A process for the dry cationization of starch
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Publication number
AU593325B2
AU593325B2
AU68793/87A
AU6879387A
AU593325B2
AU 593325 B2
AU593325 B2
AU 593325B2
AU 68793/87 A
AU68793/87 A
AU 68793/87A
AU 6879387 A
AU6879387 A
AU 6879387A
AU 593325 B2
AU593325 B2
AU 593325B2
Authority
AU
Australia
Prior art keywords
starch
silica
weight
reaction
mixer
Prior art date
1986-02-15
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.)
Ceased
Application number
AU68793/87A
Other versions
AU6879387A
(en
Inventor
Wolfgang Fischer
Michael Huss
Reinhard Dr. Stober
Klaus Dr. Udluft
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.)
Evonik Operations GmbH
Original Assignee
Degussa GmbH
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.)
1986-02-15
Filing date
1987-02-13
Publication date
1990-02-08
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1987-02-13
Application filed by Degussa GmbH
filed
Critical
Degussa GmbH
1987-08-20
Publication of AU6879387A
publication
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patent/AU6879387A/en
1990-02-08
Application granted
granted
Critical
1990-02-08
Publication of AU593325B2
publication
Critical
patent/AU593325B2/en
2007-02-13
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Status
Ceased
legal-status
Critical
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Classifications
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
C08B31/12—Ethers having alkyl or cycloalkyl radicals substituted by heteroatoms, e.g. hydroxyalkyl or carboxyalkyl starch
C08B31/125—Ethers having alkyl or cycloalkyl radicals substituted by heteroatoms, e.g. hydroxyalkyl or carboxyalkyl starch having a substituent containing at least one nitrogen atom, e.g. cationic starch
Abstract
A dry process for preparation of cationic starch ethers by reaction of starch with alkylidene epoxides in the presence of water in an alkaline medium at a temperature of 5 DEG to 40 DEG C. in the presence of a finely divided silica.
Description
L
FORM 10 SPRUSON FERGUSON COMMONWEALTH OF AUSTRALIA PATENTS ACT 1952 COMPLETE SPECIFICATION
(ORIGINAL)
FOR OFFICE USE: 6V71/-7 Class Int. Class Complete Specification Lodged: Accepted: Published: muendxnents Mads undar
II
S~~ln 49.
a~d Is C=OPIct for PLWr~LmS.& Priority: Related Art: Name of Applicant: t X Address of Applicant: Actual Inventor(s): DEGUSSA AKTIENGESELLSCHAFT Weissfrauenstrasse Frankfurt (Main), Federal Republic of Germany REINHARD STOBER, WOLFGANG FISCHER, MICHAEL HUSS and KLAUS UDLUFT Spruson Ferguson, Patent Attorneys, Level 33 St Martins Tower, 31 Market Street, Sydney, New South Wales, 2000, Australia Address for Service: Complete Specification for the invention entitled: “A PROCESS FOR THE DRY CATIONIZATION OF STARCH” The following statement is a full description of this invention, including the best method of performing it known to us SBR:eah 158T L i i- ii F~
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86 102 VO
ABSTRACT
A process for the dry cationization of starch This invention relates to a dry process for the production of cationic starch ethers by reaction of starch with alkylidene epoxides in the presence of water in alkaline medium at a temperature of from to 40’C in the presence of a finely divided silica.
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t *4 It ar I C.i 1 This invention relates to a dry process for the production of cationic starch ethers by reaction of starch with alkylidene epoxides in the presence of water in alkaline medium.
5 It is known that starch or starch-containing substances can be reacted with cationic etherifying agents by socalled dry processes. In processes such as these, the reaction is not carried out in an aqueous suspension, but with powder-form starch.
According to US-PS 4 127 563, cationization is carried out with alkylidene halohydrins at a pH value of <9 and at a temperature of from 25 to The reaction halohydrin with starch in alkaline medium, but least 30°C below the gelatinization starch, is claimed US-PS 3 346 563.
EP-PS 31 477 also describes process for alkylidene epoxides which carried out presence water, calcium hydroxide or oxide temperatures 50 120°C.
DE-OS 29 35 338 cationization starch. In this case, however, alkali excess has be neutralized.
According 4 281 109, it advisable premix etherifying agent alkalineearth then mix resulting ~pas~N.
4 15 J o l k 2 1' starch.
This procedure said achieve more uniform rapid mixing reagents so that, example, there are no local accumulations could lead swelling starch.
One feature common all processes mentioned above that etherification mixture stirred until over.
The naturally takes longer decreasing temperature. Reaction vessels occupied correspondingly long periods have stirred. addition, losses yield accepted.
The object present invention provide production cationic ethers despite low only very little stirring energy applied, briefly good yields obtained without any need sifting.
Accordingly, relates dry by medium characterized 5 40 0 C Sfinely divided silica. A thus prepared pH value>9 by weight suspension) According to the invention, the mixture of starch, alkali or alkaline-earth hydroxide or oxide, silica and alkylidene epoxide, which is generally used in the form F of an aqueous solution, is homogenized in an intensive mixer for between 10 seconds and 25 minutes and preferably for between 20 seconds and 5 minutes, subsequently removed from the circuit and the cationization reaction left to continue to completion in the storage container envisaged, such as a silo for example, or even in the packs intended for shipment.
EL.- 11 ok I I- I3 1 Accordingly, there is no longer any need to expend further mixing energy for further process steps.
In addition, it has been found to be of advantage to carry out the process at a temperature in the range over which the ambient temperature of ordinary warehouses varies, for example as a result of seasonal fluctuations, i.e. at a temperature in the range of from 18 to 30 0 C and more especially at a temperature in the range of from to Tests have shown that the epoxide used reacts off completely. At a temperature of 20 0 C, it is only possible to detect traces of <10 ppm epoxide>100 u >100 Fv >100 p.
>100 1 >100 i 0.5% 0.6% 1.0% 2.9% 10.3% distribution <100 u 99.5% <100 99.4% 99.0% 97.1% 89.7% EXAMPLE 11 According to the invention, viscosity of starch paste can be changed for same degree substitution: Potato (DS 0.026) Product test no. Activator Viscosity 3% ,a ti o t I o6, 0 .0~ 4 t(' *O 3 1 as 1, but with 2 1.0% PC-3 1.6% PC-2 2.1% PC-4 2.5% PC-5 1800 mPas 1450 600 56 0rr 00 12 Starches cationized by process according invention excellent retention values, measured DDJ on pulp suspensions consisting g>Download PDF in English
