SU367114A1 - METHOD OF OBTAINING SECONDARY ACETATE OF CELLULOSE - Google Patents
METHOD OF OBTAINING SECONDARY ACETATE OF CELLULOSEInfo
- Publication number
- SU367114A1 SU367114A1 SU1361516A SU1361516A SU367114A1 SU 367114 A1 SU367114 A1 SU 367114A1 SU 1361516 A SU1361516 A SU 1361516A SU 1361516 A SU1361516 A SU 1361516A SU 367114 A1 SU367114 A1 SU 367114A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- cellulose
- hydrolysis
- obtaining secondary
- methylene chloride
- secondary acetate
- Prior art date
Links
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- Polysaccharides And Polysaccharide Derivatives (AREA)
Description
1one
Изобретение относитс к области получени волокон из сложных эфиров целлюлозы.This invention relates to the field of producing fibers from cellulose esters.
Известен способ .получени вторичных ацетатов целлюлозы путем ацетилировани активированной целлюлозы уксусным ангидридом в среде метиленхлорида, дальнейшего гидролиза при 55-56°С и отгонки метиленхлорида при 80-85°С.There is a known method for obtaining secondary cellulose acetates by acetylating activated cellulose with acetic anhydride in methylene chloride, further hydrolysis at 55-56 ° C and distilling methylene chloride at 80-85 ° C.
Цель изобретени - сокращение процесса получени вторичного ацетата целлюлозы.The purpose of the invention is to reduce the process of producing secondary cellulose acetate.
Дл этого гидролиз провод т при постепенном повышении температуры до 75-85°С и совмеш.ают операцию гидролиза с отгонкой метиленхлорида.For this, the hydrolysis is carried out with a gradual increase in temperature to 75-85 ° C and is combined with a hydrolysis operation with methylene chloride distillation.
Пример 1. В 100 г сиропа, полученного после ацетилировани , заливают 3,65 г 96%-ного H2SO4 и 21 г воды и провод т гидролиз, постепенно поднима температуру до 75°С, до водного числа 100-101.Example 1. In 100 g of the syrup obtained after acetylation, 3.65 g of 96% H2SO4 and 21 g of water are poured and hydrolysis is performed, gradually raising the temperature to 75 ° C to a water number of 100-101.
При достижении водного числа в сироп добавл ют 34,2 г 90%-ного CHaCOONa, размешивают , ацетилцеллюлозу высаживают и сушат . Врем гидролиза и отгонки метиленхлорида сокраш,аетс с 17 час до 8,5 час.When the water number is reached, 34.2 g of 90% CHaCOONa are added to the syrup, stirred, and the cellulose acetate is precipitated and dried. The time of hydrolysis and distillation of methylene chloride is cocrush, from 17 h to 8.5 h.
Пример 2. В 100 г сиропа, полученного после ацетилировани , заливают 53 г воды, перемешивают, добавл ют 2,74 г 96%-ного H2S04 и 21 г воды и провод т гидролиз, постепенно поднима температуру до 76°С, до водного числа 100-101. Затем добавл ют 2,85 г 90%-ного СНзСООЫа, размешивают, ацетилцеллюлозу высаживают, промывают и сушат. Врем гидролиза и отгонки метиленхлорида со.краш,аетс с 13 час 45 мин до 6 час 30 мин.Example 2. In 100 g of the syrup obtained after acetylation, 53 g of water are poured, mixed, 2.74 g of 96% H2SO4 and 21 g of water are added and hydrolysis is carried out, gradually raising the temperature to 76 ° C to water number 100-101. Then, 2.85 g of 90% CH 2 COAA is added, the cellulose cellulose acetate is agitated, washed, and dried. The time of hydrolysis and distillation of methylene chloride sokrasch, is from 13 h 45 min to 6 h 30 min.
Предмет изобретени Subject invention
Способ получени вторичного ацетата целлюлозы путем этерификации в среде метиленхлорида , гидролиза в присутствии сернокислотного катализатора и отгонки метиленхлорида , отличающийс тем, что, с целью сокрашени процесса, гидролиз провод т при постепенном повышении температуры от 50-52°С до 75-85°С, совмеща его с отгонкой метиленхлорида .The method of producing secondary cellulose acetate by esterification in methylene chloride, hydrolysis in the presence of a sulfuric acid catalyst and methylene chloride distillation, characterized in that, in order to shorten the process, the hydrolysis is carried out with a gradual increase in temperature from 50-52 ° C to 75-85 ° C, combining it with the distillation of methylene chloride.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU1361516A SU367114A1 (en) | 1969-09-08 | 1969-09-08 | METHOD OF OBTAINING SECONDARY ACETATE OF CELLULOSE |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU1361516A SU367114A1 (en) | 1969-09-08 | 1969-09-08 | METHOD OF OBTAINING SECONDARY ACETATE OF CELLULOSE |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU874312579A Addition SU1474606A2 (en) | 1987-07-17 | 1987-07-17 | Gas pressure controller |
Publications (1)
Publication Number | Publication Date |
---|---|
SU367114A1 true SU367114A1 (en) | 1973-01-23 |
Family
ID=20447352
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU1361516A SU367114A1 (en) | 1969-09-08 | 1969-09-08 | METHOD OF OBTAINING SECONDARY ACETATE OF CELLULOSE |
Country Status (1)
Country | Link |
---|---|
SU (1) | SU367114A1 (en) |
-
1969
- 1969-09-08 SU SU1361516A patent/SU367114A1/en active
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