SU129817A1 - Continuous process for making polyvinyl alcohol aqueous solutions - Google Patents
Continuous process for making polyvinyl alcohol aqueous solutionsInfo
- Publication number
- SU129817A1 SU129817A1 SU634301A SU634301A SU129817A1 SU 129817 A1 SU129817 A1 SU 129817A1 SU 634301 A SU634301 A SU 634301A SU 634301 A SU634301 A SU 634301A SU 129817 A1 SU129817 A1 SU 129817A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- polyvinyl alcohol
- aqueous solutions
- continuous process
- alcohol aqueous
- making polyvinyl
- Prior art date
Links
- 239000004372 Polyvinyl alcohol Substances 0.000 title description 7
- 239000007864 aqueous solution Substances 0.000 title description 7
- 229920002451 polyvinyl alcohol Polymers 0.000 title description 7
- 238000010924 continuous production Methods 0.000 title description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 19
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 12
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 8
- 229920002689 polyvinyl acetate Polymers 0.000 description 7
- 239000011118 polyvinyl acetate Substances 0.000 description 7
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- 239000006185 dispersion Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- AXZAYXJCENRGIM-UHFFFAOYSA-J dipotassium;tetrabromoplatinum(2-) Chemical compound [K+].[K+].[Br-].[Br-].[Br-].[Br-].[Pt+2] AXZAYXJCENRGIM-UHFFFAOYSA-J 0.000 description 5
- 229910001487 potassium perchlorate Inorganic materials 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000007127 saponification reaction Methods 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical group CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 239000012259 ether extract Substances 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 1
- KXKVLQRXCPHEJC-UHFFFAOYSA-N acetic acid trimethyl ester Natural products COC(C)=O KXKVLQRXCPHEJC-UHFFFAOYSA-N 0.000 description 1
- 239000003377 acid catalyst Substances 0.000 description 1
- 239000003929 acidic solution Substances 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- VLTRZXGMWDSKGL-UHFFFAOYSA-M perchlorate Inorganic materials [O-]Cl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-M 0.000 description 1
- VLTRZXGMWDSKGL-UHFFFAOYSA-N perchloric acid Chemical compound OCl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-N 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Landscapes
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Description
Известен способ непрерывного получени поливинилового спирта из поливинилацетатной водной дисперсии, содержагпей 50% метанола, путем 0 мылени поливинилацетата при 70-80° с применением сол ной кислоты и перхлората кали .A known method for the continuous production of polyvinyl alcohol from a polyvinyl acetate aqueous dispersion containing 50% methanol, by washing polyvinyl acetate at 70-80 ° C using hydrochloric acid and potassium perchlorate.
Предлагаемый способ получени водных растворов поливинилового спирта отличаетс от известного тем, что омыление поливинилацетата провод т только в водной дисперсии. Процесс провод т в аппарате колонного типа.The proposed method for producing aqueous solutions of polyvinyl alcohol is distinguished from the known one in that the saponification of polyvinyl acetate is carried out only in an aqueous dispersion. The process is carried out in a column-type apparatus.
В колонну сверху подают водную дисперсию поливинилацетата, содержащую 30-36% сухого веидества, и добавл ют 0,5-2,0% смешанного кислотного катализатора, состо щего из концентрированной сол ной кислоты и перхлората кали . Температуру в колонне поддерживают на уровне 70-80° путем подачи под тарелки колонны вод ного пара.An aqueous dispersion of polyvinyl acetate, containing 30-36% of dry matter, is introduced into the column from the top, and 0.5-2.0% of a mixed acid catalyst consisting of concentrated hydrochloric acid and potassium perchlorate is added. The temperature in the column is maintained at a level of 70-80 ° by feeding water vapor under the plates of the column.
Процесс гидролиза завершают через 2-4 час, и в колонне получают водный раствор поливинилового спирта (с содержанием ацетатных групп менее 1%) и уксусной кислоты. Указанный раствор непрерывно отбирают снизу колоины и подают на следующую колонну сверху, куда снизу поступает эфир дл извлечени уксусной кислоты из водного раствора.The hydrolysis process is completed in 2-4 hours, and an aqueous solution of polyvinyl alcohol (with less than 1% acetate groups) and acetic acid is obtained in the column. This solution is continuously withdrawn from the bottom of the coloins and fed to the next column from the top, where the ether enters from the bottom to extract the acetic acid from the aqueous solution.
Эфирный экстракт, непрерыВНО отбираемый сверху экстракционной колонны, подвергают дальнейшей ректификации с получением эфира и уксусной кислоты, а водный раствор поливинилового спирта, непрерывно отбираемый снизу, отпаривают вод ным паром и примен ют дл пр дени синтетического волокна.The ether extract, continuously taken from the top of the extraction column, is subjected to further distillation to obtain ether and acetic acid, and an aqueous solution of polyvinyl alcohol, continuously taken from the bottom, is stripped with water vapor and used to spin synthetic fiber.
Предложенный способ омылени поливинилацетата в водной дисперсии устран ет трудоемкие операции и больщие потери метанола и метилацетата, имевщие место в известном способе.The proposed method of saponification of polyvinyl acetate in an aqueous dispersion eliminates the time-consuming operations and the large losses of methanol and methyl acetate occurring in the known method.
ль 129817-- 2 -Eh 129817-- 2 -
Пример 1. К 500 г водноР дисперсии поливини.лацетата добав .1Я1ОТ 1,5 г перхлората кали и 15 мл сол ной кислоты (36%). В результате 1идролиза через 4 час получают 580 г водного раствора поливинилового спирта и уксусной кислоты.Example 1. To 500 g of a water-P dispersion of polyvini.acetate, add NaClО 1.5 g of potassium perchlorate and 15 ml of hydrochloric acid (36%). As a result of hydrolysis after 4 hours, 580 g of an aqueous solution of polyvinyl alcohol and acetic acid are obtained.
Содержание: сухих вендеств-20%, кислоты-20,8%, ацетатны.х групп в выделенном поли}зиниловом спирте-0,84%.Content: dry vendestv-20%, acid-20.8%, acetate groups in isolated poly-zinyl alcohol-0.84%.
После экстрагировани кислого раствора эфиром получают эфирный экстракт, содержан1ий 15% уксусной кислоты, а после отготжи эфира содержание уксусной кисюты в остатке составл ет 80%.After extracting the acidic solution with ether, an ether extract is obtained containing 15% acetic acid, and after the ether is prepared, the content of acetic acid in the residue is 80%.
Пример 2. В отличие от примера 1, реакцию провод т с катализатором , состо цим из 2,0 мл сол ной кислоты и 2,5 г перхлората кали . Продолжительность реакции-3 час.Example 2. Unlike example 1, the reaction is carried out with a catalyst consisting of 2.0 ml of hydrochloric acid and 2.5 g of potassium perchlorate. The reaction time is 3 hours.
Пример 3. В отличие от примера 1, реакцию провод т е катализатором , состо щим из 3,0 мл сол ной кислоты и 2,5 г перхлората кали . Продолжите.лыЮСть реакции та же, что и в п-римере 1.Example 3. In contrast to Example 1, the reaction is carried out with a catalyst consisting of 3.0 ml of hydrochloric acid and 2.5 g of potassium perchlorate. Continue. The reaction is the same as in n-Romer 1.
Предмет изобретени Subject invention
Непрерывный способ получени водных растворов поливинилового спирта путем омылени поливинилацетата при температуре 70-80° с применением сол ной кислоты и перхлората ка,чи , отличающийс тем, что, с целью упрощени процесса, омыление поливинилацетата провод т в водной дисперсии.The continuous process for preparing aqueous solutions of polyvinyl alcohol by saponifying polyvinyl acetate at a temperature of 70-80 ° C using hydrochloric acid and perchlorate, is characterized in that, in order to simplify the process, saponification of polyvinyl acetate is carried out in an aqueous dispersion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU634301A SU129817A1 (en) | 1959-07-18 | 1959-07-18 | Continuous process for making polyvinyl alcohol aqueous solutions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU634301A SU129817A1 (en) | 1959-07-18 | 1959-07-18 | Continuous process for making polyvinyl alcohol aqueous solutions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU129817A1 true SU129817A1 (en) | 1959-11-30 |
Family
ID=48400959
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SU634301A SU129817A1 (en) | 1959-07-18 | 1959-07-18 | Continuous process for making polyvinyl alcohol aqueous solutions |
Country Status (1)
| Country | Link |
|---|---|
| SU (1) | SU129817A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU211919U1 (en) * | 2022-01-10 | 2022-06-28 | Общество С Ограниченной Ответственностью "Газпром Добыча Надым" | INSTALLATION FOR PREPARING A SOLUTION OF POLYVINYL ALCOHOL |
-
1959
- 1959-07-18 SU SU634301A patent/SU129817A1/en active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU211919U1 (en) * | 2022-01-10 | 2022-06-28 | Общество С Ограниченной Ответственностью "Газпром Добыча Надым" | INSTALLATION FOR PREPARING A SOLUTION OF POLYVINYL ALCOHOL |
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