GB770763A - Improvements in or relating to the production of starch derivatives and conversion products - Google Patents
Improvements in or relating to the production of starch derivatives and conversion productsInfo
- Publication number
- GB770763A GB770763A GB7382/53A GB738253A GB770763A GB 770763 A GB770763 A GB 770763A GB 7382/53 A GB7382/53 A GB 7382/53A GB 738253 A GB738253 A GB 738253A GB 770763 A GB770763 A GB 770763A
- Authority
- GB
- United Kingdom
- Prior art keywords
- vacuo
- water
- temperature
- starch
- sodium hydroxide
- 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
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B30/00—Preparation of starch, degraded or non-chemically modified starch, amylose, or amylopectin
- C08B30/12—Degraded, destructured or non-chemically modified starch, e.g. mechanically, enzymatically or by irradiation; Bleaching of starch
Landscapes
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biochemistry (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
Abstract
In the process for making starch derivatives and their conversion products disclosed in the parent Specification, the etherifying or acetal-forming agent is added continuously or at intervals after at least part of the evaporation of water has been effected and, if thermal treatment is employed, during or after such treatment. Evaporation of water may be interrupted temporarily by reducing the temperature and at the same time partially reducing the vacuum. In an example, moist starch is impregnated with hydrochloric acid gas, water is evaporated from the mixture in vacuo with gradual raising of the temperature to 100 DEG C., the vacuum is maintained and the temperature is increased to 165 DEG C. Powdered paraformaldehyde is then mixed in and the temperature is maintained until the desired degree of conversion is attained. The product is then cooled in vacuo. In another example, moist starch impregnated with sodium carbonate solution is heated up to 70 DEG C. in vacuo to evaporate some water. The starch is then mixed with more aqueous sodium hydroxide and ethylene chlorhydrin and heated to 125 DEG C. in vacuo to evaporate more water. More aqueous sodium hydroxide and ethylene chlorhydrin are added and a further amount of water is evaporated by heating in vacuo up to 140 DEG C. Still more aqueous sodium hydroxide and ethylene chlorhydrin are added and the temperature is maintained until the desired degree of conversion is attained and the product is then cooled in vacuo. Specification 630,914, [Group V], also is referred to.ALSO:In the process for making starch derivatives and their conversion products disclosed in the parent Specification, the etherifying or acetal-forming agent is added continuously or at intervals after at least part of the evaporation of water has been effected, and, if thermal treatment is employed, during or after such treatment. Evaporation of water may be interrupted temporarily by reducing the temperature and at the same time partially reducing the vacuum. In an example, moist starch is impregnated with hydrochloric acid gas, water is evaporated from the mixture in vacuo with gradual raising of the temperature to 100 DEG C., the vacuum is maintained and the temperature is increased to 165 DEG C. Powdered paraformaldehyde is then mixed in and the temperature is maintained until the desired degree of conversion is attained. The product is then cooled in vacuo. In another example, moist starch impregnated with sodium carbonate solution is heated up to 70 DEG C. in vacuo to evaporate some water. The starch is then mixed with more aqueous sodium hydroxide and ethylene chlorhydrin and heated to 125 DEG C. in vacuo to evaporate more water. More aqueous sodium hydroxide and ethylene chlorhydrin are added and a further amount of water is evaporated by heating in vacuo up to 140 DEG C. Still more aqueous sodium hydroxide and ethylene chlorhydrin are added and the temperature is maintained until the desired degree of conversion is attained and the product is then cooled in vacuo. Specification 630,914 is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH770763X | 1952-03-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB770763A true GB770763A (en) | 1957-03-27 |
Family
ID=4535371
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7382/53A Expired GB770763A (en) | 1952-03-18 | 1953-03-17 | Improvements in or relating to the production of starch derivatives and conversion products |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB770763A (en) |
-
1953
- 1953-03-17 GB GB7382/53A patent/GB770763A/en not_active Expired
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