Method for recovering butanol and octanol by hydrogenation before butanol waste liquid
A pre-hydrogenation and butyl-octyl alcohol technology, which is applied in chemical instruments and methods, hydrogenation preparation, and organic compound preparation, can solve the problems of low utilization rate and high energy consumption, and achieve improved utilization rate, reduced separation cost, The effect of increasing economic benefits
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 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
[0031] (1) Hydrogenation: The waste liquid of butanol and octanol and hydrogen enter the hydrogenation reactor equipped with a hydrogenation catalyst. Hydrogenation generates butanol, octenal hydrogenates to generate octanol, and obtains the reaction solution after hydrogenation; hydrogenation is a liquid phase reaction, and the hydrogenation catalyst is a nickel-based catalyst BC-H-48 produced by the Beijing Research Institute of Chemical Industry. The liquid space velocity of octanol waste liquid is 0.7h -1 , the amount of hydrogen fed is 1.05 times the hydrogenation consumption of butanol waste liquid;
[0032] (2) Dehydration: The reaction liquid after hydrogenation from the hydrogenation unit enters the dehydration tower, and through the rectification process, water, hydrocarbons, and hydrogenation remaining isobutyraldehyde and n-butyraldehyde are steamed from the top of the dehydration tower, and are condensed in the separation The water phase is separated from the lay...
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The invention discloses a method for recovering butanol and octanol through butanol and octanol waste liquid pre-hydrogenation, and belongs to the technical field of butanol and octanol. The method is provided to solve the problem of low utilization rate or high energy consumption in the prior art. The method comprises: hydrogenating aldehyde in the butanol and octanol waste liquid to form alcohol, and carrying out a rectification process to obtain a butanol product and an octanol product. The method concretely comprises the steps of hydrogenation, dewatering, butanol separation, butanol removal, impurity oil separation, octanol separation, butanol recovery and octanol recovery. The method greatly improves the utilization rate of the butanol and octanol waste liquid, greatly improves the utilization values, and increases economic benefits. The method reduces the composition complexity of a material through a hydrogenation process in order to reduce the difficulty of a rectifying unit and reduce the separation cost.
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 田保亮彭晖唐国旗鲁树亮李宝芹戴伟
Owner CHINA PETROLEUM & CHEM CORP