Separation method for post-hydrogenation of butyl octanol waste liquid
A separation method, the technology of butanol and octanol, which is applied in the field of obtaining butanol and octanol products, can solve the problems of high energy consumption and low utilization rate, and achieve the effect of reducing separation cost, improving utilization rate and reducing difficulty
Active Publication Date: 2018-12-28
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
[0009] In order to solve the problems of low utilization rate or high energy consumption in the prior art, a method is proposed to hydrogenate the aldehydes in the butanol waste liquid to alcohol, and then undergo a rectification process to obtain butanol and octanol products.
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Embodiment 1
[0028] (1) Dehydration: The waste liquid of butanol and octanol enters the dehydration tower, and through the rectification process, water, hydrocarbons, isobutyraldehyde and n-butyraldehyde are distilled from the top of the dehydration tower, and the water phase is separated and discharged in the stratifier after being condensed, and the oil phase is discharged. Partial extraction, partial reflux, extracting the bottom stream from the bottom of the tower;
[0029] (2) Separation of butanol: the stream from the bottom of the dehydration tower enters the butanol tower, and through the rectification process, the butanol product is extracted from the butanol tower top, and the tower bottom stream is extracted from the bottom of the tower;
[0030] (3) Separation of miscellaneous oil: the stream from the bottom of the butanol tower enters the miscellaneous oil tower, and through the rectification process, the miscellaneous oil containing butyl butyrate, heptanol, butanol, octenol, ...
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The invention discloses a butanol and octanol waste liquid post-hydrotreatment separation method, belongs to the technical field of butanol and octanol, and aims at solving the problems of low utilization rate or high energy consumption in the prior art. According to the provided method, firstly, aldehyde in butanol and octanol waste liquid is hydrogenated into alcohol; through a rectifying process, butanol and octanol products are obtained. The method comprises the concrete steps of dehydration, butanol separation, impurity oil separation, octanol separation, hydrogenation of butyraldehyde separated from the top of a dehydrating tower and octenal separated from the top of an impurity oil tower, implementation of dehydrogenation process after each hydrogenation process, and operation return to the processes of butanol separation, octanol separation and the like. The utilization rate of butanol and octanol waste liquid can be greatly improved; the utilization value is greatly improved; the economic benefits are increased. The method has the advantages that through the hydrogenation process, the composition complexity degree of materials is reduced; the difficulty of a rectification unit can be lowered; the separation cost is reduced.
Description
technical field [0001] The invention relates to a method for recovering butanol and octanol from butanol waste liquid, more specifically, the invention relates to a method for obtaining butanol and octanol products through hydrogenation and refining process. Background technique [0002] Butanol and octanol (referred to as butanol) are mainly used in the production of plasticizers dioctyl phthalate (DOP) and dibutyl phthalate (DBP). With the development of my country's plastics industry, the market demand for octyl alcohol is increasing year by year, and the production capacity of octyl alcohol in China is also increasing year by year. There is a small amount of discharge from the evaporator, phase separator and weight removal tower of the reactor of the butanol plant, and the discharged mixed liquid is called the butanol raffinate, which is equivalent to about 10% of the product quality of butanol, and It contains a lot of valuable components, but due to its complex compos...
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IPC IPC(8): C07C31/12C07C31/125C07C29/80C07C29/141C07C29/17
Inventor 田保亮唐国旗鲁树亮彭晖李宝芹戴伟
Owner CHINA PETROLEUM & CHEM CORP