Low-energy-consumption separation method of butanol and octanol waste liquid through backend hydrogenation
A separation method and low energy consumption technology, which is applied in chemical instruments and methods, hydrogenation preparation, preparation of organic compounds, etc., can solve the problems of low utilization rate and high energy consumption, so as to improve utilization rate, reduce separation cost and difficulty Effect
Active Publication Date: 2016-12-07
CHINA PETROLEUM & CHEM CORP +1
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[0009] In order to solve the problems of low utilization rate and high energy consumption in the prior art, a method of hydrogenating aldehydes in butanol and octanol waste liquid into alcohols is proposed, and then undergoes a rectification process to obtain butanol and octanol products.
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Embodiment 1
[0030] (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;
[0031] (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;
[0032] (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, and 3-methyl-4-hep...
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The invention discloses a low-energy-consumption separation method of butanol and octanol waste liquid through backend hydrogenation, and belongs to the technical field of butanol and octanol. In order to solve the problem that in the prior art, the utilization rate of raw materials of the butanol and octanol waste liquid is not high or the energy consumption is high, the invention provides the method for firstly performing hydrogenation on aldehydes in the butanol and octanol so as to obtain alcohols; and then performing a rectification process so as to obtain butanol products and octanol products. The method comprises specific steps of performing dehydration, separating the butanol, separating impurity oil, separating the octanol, removing the octanol, performing hydrogenation on butyraldehyde separated from the top of a dewatering tower, performing hydrogenation on octenal separated from the top of an impurity oil tower, performing dehydrogenation processes after each hydrogenation step, and then separately returning to the steps of separating the butanol, separating the octanol and the like, so that the utilization rate of the butanol and octanol waste liquid can be greatly increased, the utilization value is greatly increased, and the economic benefits are increased. Through the hydrogenation process, the complexity of compositions of materials is reduced, the difficulty of the rectification units can be reduced, and 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): C07C31/12C07C31/125C07C29/141C07C29/17C07C29/80
Inventor 唐国旗田保亮鲁树亮彭晖李宝芹戴伟
Owner CHINA PETROLEUM & CHEM CORP