SU1366173A1

SU1366173A1 - Method of separating the mixture of acetone-chloroform azeotropic composition

Info

Publication number: SU1366173A1
Application number: SU864035871A
Authority: SU
Inventors: Tamara G Pavlenko; Alla K Frolkova; Lyudmila A Pirog; Valentina M Kareeva; Vladimir S Timofeev
Original assignee: Mo I Tonkoj Khim Technologii
Priority date: 1986-03-14
Filing date: 1986-03-14
Publication date: 1988-01-15

Description

Изобретение касается разделения смеси веществ, в частности смеси ацетон -СНС1₃азеотропного состава,The invention relates to the separation of a mixture of substances, in particular a mixture of acetone-CHC1 ₃ azeotropic composition,

и может быть использовано в.проиэводстве, например, термостабилизатора.and can be used in. production, for example, thermal stabilizer.

Цель - повышение чистоты целевых продуктов. В процессе ректификационного разделения указанного азеотропа используют другой экстрактивный полярный агент — диметилформамид (ДМФА), взятый в 2,5 — 3—кратном избытке по отношению к исходной смеси, ДМФА подают на верхний уровень колонны. В дистиллят отбирают товарный ацетон, а в кубе остается смесь ДМФА - СНС1₃. Последнюю ректифицируют с возвратом кубового ДМФА в процесс и отбором целевого СНС1₅ в виде головного продукта. Степень чистоты ДМФА составляет 99,9 %, что свидетельствует о вы- с соком эффекте разделения и качестве целевых веществ.The goal is to increase the purity of the target products. In the process of distillation separation of this azeotrope, another extractive polar agent is used - dimethylformamide (DMF), taken in 2.5 - 3 — fold excess relative to the initial mixture, DMF is fed to the upper level of the column. Commodity acetone is taken to the distillate, and a DMF mixture, CHC1 _3, remains in the cube. The latter is rectified with the return of vat DMF to the process and the selection of the desired CHC1 ₅ as the main product. The degree of purity of DMF is 99.9%, which indicates a high separation effect and the quality of the target substances.

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флегмовом числе 1,3-1,5 с отбором в виде головного продукта хлороформа — 100%-ной степени чистоты, из куба второй колонны выводят ДМФА с примесью хлороформа не более 0,1 % и направляют на орошение в первую колонну,reflux number 1.3-1.5 with the selection of chloroform as a head product - 100% purity, the DMF with admixture of chloroform is not more than 0.1% removed from the bottom of the second column and sent to the first column for irrigation,

П р и м е р 2. Проводят процесс'PRI mme R 2. Carry out the process'

Ю аналогично примеру 1, но при массовом соотношении ДМФА: исходная смесь 3:1, а кубовую жидкость - смесь хлороформа и ДМФА подвергают ректификации во второй колонне при флегмовом 15 числе 1,6.Yu analogously to example 1, but with a mass ratio of DMF: initial mixture of 3: 1, and the bottom of the liquid - a mixture of chloroform and DMF is subjected to rectification in the second column with a reflux 15 of 1.6.

Таким образом, предложенный способ разделения смеси ацетон — хлороформ позволяет улучшить качество регенерированных растворителей, сни20 зить стоимость целевого продукта и обеспечить безопасные условия труда.Thus, the proposed method for separating an acetone – chloroform mixture can improve the quality of the regenerated solvents, reduce the cost of the target product, and ensure safe working conditions.

Claims

Claim

The method of separation of a mixture of acetone chloroform azeotropic composition of extractive distillation in the presence of an extractive polar agent, characterized in that

30 in order to simplify the process and increase the purity of the target products, dimethylformamide is used as an extractive agent and the process is carried out at a mass ratio of dimethylformamide: initial mixture (2.5–3.0): 1 by feeding the agent to the upper level of the column and selecting commercial acetone , in a cube of a mixture of chloroform - dimethylformamide with .40, followed by its rectification and return of dimethylformamide to the process.

The invention relates to chemical technology, in particular to a method for separating a mixture of chloroform - acetone with azeotropic composition, which is one of the links in the solvent regeneration scheme used, for example, in the manufacture of a heat stabilizer.

The aim of the invention is to simplify the process and increase the purity of the target products,

The method consists in extractive distillation in the presence of an extractive polar agent - dimethylformamide (DMF) and carrying out the process at a mass ratio of dimethylformamide: initial mixture (2.5-3.0): 1 when feeding the agent to the upper level of the column and selecting commercial product acetone in distillate, and in a cube of a mixture of chloroform - dimethylformamide, followed by its rectification and return of dimethylformamide to the process, 25

Example 1. The initial mixture containing acetone and chloroform, served in the amount of 60 g / h in the middle of the column. As an extractive agent, DMF is fed to the upper level of the column at a weight ratio of 1: 2.5. The process of extractive distillation is carried out with the complete selection of the top product on a column with an efficiency of 15 tons, acetone containing 1.1% chloroform is taken from the top of the column, and the mixture of chloroform and DMF, which is subjected to rectification in the second column, is taken as a bottom liquid. in the column efficiency 12 t.t. at