SU367114A1 - METHOD OF OBTAINING SECONDARY ACETATE OF CELLULOSE - Google Patents

METHOD OF OBTAINING SECONDARY ACETATE OF CELLULOSE

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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
Application number
SU1361516A
Other languages
Russian (ru)
Inventor
Т. М. Кубаенко В. И. Сидоров Р. Б. Цоколаев Владимирский химический завод В. Д. Валгин
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Filing date
Publication date
Application filed filed Critical
Priority to SU1361516A priority Critical patent/SU367114A1/en
Application granted granted Critical
Publication of SU367114A1 publication Critical patent/SU367114A1/en

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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.

SU1361516A 1969-09-08 1969-09-08 METHOD OF OBTAINING SECONDARY ACETATE OF CELLULOSE SU367114A1 (en)

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

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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)

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