SU1625861A1 - Purification method of trichloroethylene from acid admixture - Google Patents

Purification method of trichloroethylene from acid admixture Download PDF

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Publication number
SU1625861A1
SU1625861A1 SU884603717A SU4603717A SU1625861A1 SU 1625861 A1 SU1625861 A1 SU 1625861A1 SU 884603717 A SU884603717 A SU 884603717A SU 4603717 A SU4603717 A SU 4603717A SU 1625861 A1 SU1625861 A1 SU 1625861A1
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USSR - Soviet Union
Prior art keywords
purification
tce
trichlorethylene
acidic impurities
magnesia
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SU884603717A
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Russian (ru)
Inventor
Рудольф Михайлович Терехин
Анатолий Яковлевич Бердутин
Лев Александрович Дмитриев
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Воронежский технологический институт
Предприятие П/Я Г-4601
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    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C17/00Preparation of halogenated hydrocarbons
    • C07C17/38Separation; Purification; Stabilisation; Use of additives

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

Изобретение касаетс  производства трихлорэтилена, в частности его очистки от кислых примесей, может б. использовано в негатехимт. Цель - n iрешение качества л стабильности цслсього продукта. Очистку ведут обработкой трихлорэтилена щелочным агентом - мт- незнеи ф-лы JMgCO а, Мр,(ОН)о 3 Н20 при массовом соотнесении 1:(0,02- 0,025) с последующей дистилл цией и выделением целевого продукта.В JTOM случае последний сохран ет свою стабильность не менее 3 сут при л)(т- ви  изменени  рН водной выт л-ки, который сохран етс  на уровне Я-9. 1 табл.The invention relates to the production of trichlorethylene, in particular its purification from acidic impurities, b. used in negatechimt. The goal is to solve the quality and stability of the entire product. Purification is carried out by treating trichlorethylene with an alkaline agent — mtzneznyi f-ly JMgCO a, Mp, (OH) o 3 H20 with a mass ratio of 1: (0.02– 0.025) followed by distillation and isolation of the target product. In the JTOM case, the latter is saved Its stability is not less than 3 days at 1) (the t-change in the pH of the aqueous extract, which is maintained at the level I-9. Table 1.

Description

Изобретение относитс  к спосоиу очистки трихлорэтилена (ТХЭ), используемого , например, как растворитель при парожидкостной очистке электронно-оптических систем от кислых примесей .The invention relates to a process for the purification of trichlorethylene (TCE), used, for example, as a solvent in the vapor-liquid purification of electron-optical systems from acidic impurities.

Целью изобретени   вл етс  улучшение качества целевого продукта и повышение его стабильности при хранении.The aim of the invention is to improve the quality of the target product and increase its stability during storage.

Пример. В три одинаковые стекл нные колбы заливают по 100 г исходного ТХЭ с рН 2,5 его водной выт жки и по 1 г соответственно сорбента - нейтрализатора (поташ, сода, магнези  гранул ции около 0,1-0,5 мм). В идентичных услови х перемешивани  при 50-70°С соответственно через 0,5; 1; 1,5 и 2 ч отбирают пробы по 1 мл из каждой колбы дл  определени  рН водной выт жки ТХЭ.Example. Three identical glass flasks are poured on 100 g of initial TCE with pH 2.5 of its aqueous extract and 1 g of sorbent – neutralizer each (potash, soda, magnesia granulation about 0.1–0.5 mm). Under identical conditions of stirring at 50-70 ° C, respectively, after 0.5; one; 1.5 and 2 hours, 1 ml samples are taken from each flask to determine the pH of the aqueous extract of TCE.

Дл  изменени  соотношени  реагентов в опытах ввод т по 2; 2,5 и 3 г сорбента; соответствующие значени  рНIn order to change the ratio of reagents in experiments, 2 are introduced; 2.5 and 3 g of sorbent; corresponding pH values

при этом представлены в таблице, причем концентраци  кислых примесей в исходном ТХЭ в пересчете на сол ную кислоту 0,7-8 г/л.however, they are presented in the table, with the concentration of acidic impurities in the starting TCE calculated as hydrochloric acid 0.7-8 g / l.

В результате пропускани  ТХЭ через магнезию рН водной выт жки увеличиваетс  с 2,5-3 до 8,4-10,4. После удалени  кислых примесей провод т дистилл цию ТХЭ, при этом кислотность практически не мен етс .As a result of passing TCE through magnesia, the pH of the aqueous extract increases from 2.5-3 to 8.4-10.4. After removal of the acidic impurities, TCE is distilled, while the acidity remains almost unchanged.

Как видно из данных, приведенных в таблице, массовое соотношение ТХЭ к магнезии, равное 1:(0,иГ-и,025),  вл етс  оптимальным, так как при соотношении менее 1:0,02 не достигаете полна  нейтрализаци , а при соотношении 1:0,025 достигаетс  полна  нейтрализаци , и следовательно, дальнейшее добавление магнезии не целесообразно.As can be seen from the data presented in the table, the mass ratio of TCE to magnesia, equal to 1: (0, IG-i, 025), is optimal, since with a ratio less than 1: 0.02 you do not achieve full neutralization, and with a ratio 1: 0.025 is achieved by complete neutralization, and therefore, the further addition of magnesia is not advisable.

Предлагаемый способ позвол ет существенно улучшить, качество очистки ТХЭ or кислых примесей в сравнении с известным, где используют пстага. Три (У)The proposed method allows to significantly improve the quality of purification of TCE or acidic impurities in comparison with the known, where pstag is used. Three (U)

с:with:

сьis smiling

ND СПND SP

00 О00 Oh

хлорэтилен, обработанный магнезией, в услови х его хранени , сохран ет свою стабильность не менее 3 сут, при этом рН 8-9 водной выт жки не измен етс .Chloroethylene, treated with magnesia, under conditions of its storage, retains its stability for at least 3 days, while the pH 8–9 of the aqueous extract does not change.

Claims (1)

Формула изобретени Invention Formula что, с целью улучшени  качества целе-. вого продукта и повышени  его стабильности при хранении, в качестве щелочного агента используют магнезию формулыthat, in order to improve the quality of the target. product and increase its storage stability, as an alkaline agent use magnesia of the formula 3MgC03- Mg(OH)2 SHgO3MgC03-Mg (OH) 2 SHgO Способ очистки трихлорэтилена от кислых примесей путем обработки щелоч- юThe method of purification of trichlorethylene from acidic impurities by treatment with alkali ным агентом с последующей дистилл ци- при массовом соотношении трихлорэти- ей, отличающийс  тем, лена и магнезии, равном 1:0,02-0,025.with a distillation mass ratio of trichlorethium, characterized in that of flax and magnesia, equal to 1: 0.02-0.025. 2/1002/100 2,5/1002.5 / 100 3/1003/100 ПоташPotash 1/1001/100 2/1002/100 ПоташPotash 2,5/1002.5 / 100 3/1003/100 1/1001/100 2/1002/100 2,5/1002.5 / 100 3MgC03- Mg(OH)2 SHgO3MgC03-Mg (OH) 2 SHgO 6,46.4 7,1 7,3 7,7 7,2 7,9 8,0 8,1 7,5 8,0 8,0 8,1 7,8 8,0 8,0 8,0 5,8 6,0 6,1 6,2 6,2 6,7 6,8 7,0 6,3 6,9 7,07.1 7.3 7.7 7.2 7.9 8.0 8.1 7.5 8.0 8.0 8.1 7.8 8.0 8.0 8.0 5.8 6, 0 6.1 6.2 6.2 6.7 6.8 7.0 6.3 6.9 7.0 7,1 6,57.1 6.5 6,86.8 6,96.9 7,07.0 .8,4.8,4 9,19.1 10,010.0 10,210.2 9,39.3 9,99.9 10,110.1 10,410.4 9,59.5 Примечание. После очистки ТХЭ концентраци  кислыхNote. After purification of TCE, the concentration of acidic примесей соответственно в пересчете на сол ную кислоту (0,7-7,0)- 10 г/л.impurities, respectively, in terms of hydrochloric acid (0.7-7.0) - 10 g / l.
SU884603717A 1988-11-09 1988-11-09 Purification method of trichloroethylene from acid admixture SU1625861A1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5306850A (en) * 1992-04-03 1994-04-26 Solvay (Societe Anonyme) Purification process for a hydrofluoroalkane

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Инженерна спецификаии 34-8-12, 1985. *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5306850A (en) * 1992-04-03 1994-04-26 Solvay (Societe Anonyme) Purification process for a hydrofluoroalkane

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