Separation method for pyrolysis and hydrogenation of butanol and octanol waste liquid

Abstract

The invention discloses a separation method integrating splitting and hydrogenation for butanol and octanol waste liquid, 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 service life of a catalyst is short, the invention provides the method for firstly removing heavy constituents in the butanol and octanol waste liquid, performing reorganizing and splitting on the bottom of a heavy-constituent-removing tower for recycling, and performing mixing and hydrogenation on aldehydes so as to obtain alcohols; and then performing a rectification process so as to obtain high-purity butanol products and high-purity octanol products. The method comprises the specific steps of removing the heavy constituents, performing hydrogenation, performing dehydration, separating butanol products, and extracting octanol products from a lateral line and the like; and therefore, the utilization rate of the butanol and octanol waste liquid is greatly increased, the economic benefits are increased, the complexity of components of materials is also reduced, the difficulty of rectification units can be reduced, and the separation cost is reduced. In addition, in the separation method disclosed by the invention, firstly heavy constituents in C12 and C16 in the butanol and octanol waste liquid are removed, so that the colloid passing through a catalyst bed layer in a reactor is greatly reduced, prolonging of the service life of the catalyst is facilitated, and the stability of a hydrogenation device is improved.

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...

AI Technical Summary

Problems solved by technology

CN102309968A discloses a liquid-phase hydrogenation catalyst for aldehydes, nickel or its oxide is 8-35%, at least one element in IA or IIA group or its oxide is (0.01-2.0)wt%, IIIA or IV group At least one element or its oxide is (0.01-20.0)wt%, the rare earth element is (0.01-5)wt%, and alumina is the carrier. The catalyst has high activity at low temperature, but the catalyst composition is relatively complex

This method has the problems of many separation equipments, octanol is distilled from the top of the rectification tower twice, and high energy consumption.

[0009] Some of the existing butanol waste liquid hydrogenation technologies have the problem of low raw material utilization rate, some have the problem of high energy consumption, and some have the problem of short catalyst life

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