Method for separating mixed solution of isopropanol, tert-butanol and water in combination with double extractive distillation tower
An extractive distillation tower and a mixed solution technology are applied in chemical instruments and methods, preparation of organic compounds, preparation of hydroxyl compounds, etc., to achieve the effects of simple steps and simple separation processes
Active Publication Date: 2017-03-08
NANJING NORMAL UNIVERSITY
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[0003] In the production of chemical, pharmaceutical and pesticide intermediates, isopropanol and tert-butanol are widely used as solvents or raw materials. During the production process, a certain amount of mixed solution of isopropanol, tert-butanol and water will be produced. For isopropanol and water The separation of , tert-butanol and water has been separated by salt distillation, extraction and adsorption at home and abroad, but for the separation of the mixed liquid composed of isopropanol, tert-butanol and water, high-purity Virahol and tert-butanol, and the method for recycling has not been reported yet
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[0026] The technical solution of the present invention will be described in further detail below through specific examples, but it must be pointed out that the following examples are only used to describe the content of the invention, and do not constitute limitations to the protection scope of the present invention.
[0027] The process flow chart of double extraction and rectification of the present invention in combination with separation of tert-butanol, isopropanol and water mixed solution is as follows figure 1 , the experimental device of the extractive distillation column refers to figure 2 , wherein 1 is the first extractive distillation tower, 2 is the first solvent regeneration tower, 3 is the second extractive distillation tower, 4 is the second solvent regeneration tower, 5, 6, 7, 8 are condensers, 9, 10 , 11, 12 are reboilers, 13 are raw material tanks, 14 are raw material pumps, 15 are glass rotameters, 16 are tower kettle samplers, 17 are electric heating jack...
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A process for double-extraction rectification tower combined separation of tert-butyl alcohol, isopropyl alcohol and water comprises the steps: firstly, a mixed solution of isopropyl alcohol, tert-butyl alcohol and water is extracted, rectified and separated with a composite extracting agent ethylene glycol solution of 10-15% calcium chloride, a 98.8% or more isopropyl alcohol and tert-butyl alcohol mixed solution is obtained at the tower top, a composite extracting agent containing water is obtained at the tower bottom, and the composite solvent is recycled after being treated by a regeneration tower; the tert-butyl alcohol and isopropyl alcohol mixed solution obtained at the tower top of a first extraction rectification tower is separated by a second extraction rectification tower, an extracting agent is a sulfolane solution containing 20-30% propylene glycol, 96.5% or more isopropyl alcohol can be obtained at the tower top, an extracting agent containing the tert-butyl alcohol mixed solution is obtained at the tower bottom and is treated by a second solvent regeneration tower, 96.4% or more tert-butyl alcohol is obtained at the tower top, and an extracting agent obtained at the tower bottom is recycled. The extraction separation process only needs secondary extraction rectification, the separation process is simple, and the contents of isopropyl alcohol and tert-butyl alcohol both reach 96.0% or more.
Description
technical field [0001] The invention relates to a method for recycling an aqueous solution of isopropanol and tert-butanol, in particular to a method for separating mixed solutions of isopropanol, tert-butanol and water in combination with double extraction and rectification towers. Background technique [0002] Isopropanol and tert-butanol are important raw materials and solvents for pesticides, dyes, medicines and fragrances. Isopropanol is mainly used as a dehydrating agent in pharmaceuticals, cosmetics, plastics, spices, coatings and electronics industries, as well as raw materials and solvents for the preparation of pesticide intermediates; in addition, it is also used as a cleaning agent for circuit boards and electronic equipment manufacturing, etc. Has a wide range of uses. As a raw material, tert-butanol can be used as a fuel additive for internal combustion engines (to prevent icing of carburetors) and an antiknock agent; as an intermediate in organic synthesis an...
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IPC IPC(8): C07C29/84C07C31/10C07C31/12
CPCC07C29/84C07C31/12C07C31/10
Inventor 顾正桂冯微孙昊
Owner NANJING NORMAL UNIVERSITY