Continuous distillation method and device for refining furfuryl alcohol

Abstract

The invention relates to a continuous rectifying method and a device for refining furfuryl alcohol. The method includes removing heavy components with the boiling point higher than that of furfuryl alcohol in a heavy component removing tower through rectifying, and removing light components with the boiling point lower than that of furfuryl alcohol in a light component removing tower through rectifying. The device comprises the heavy component removing tower 2 and light component removing tower 10 connected through a heavy component removing tower circulating pump 3, a valve and a sealing pipe, wherein a raw material inlet 1 is disposed on the heavy component removing tower 2, the heavy component removing tower and the light component removing tower are respectively provided with the circulating pump 3, a heat exchanger 9, a circulating pump 11 and a heat exchanger 15 at the top thereof, and provided with a reboiler 4 and a reboiler 12 at the bottom thereof, and a product outlet is arranged on the light component removing tower 10. The method really realizes continuous production process of furfuryl alcohol coarse product refining in the furfuryl alcohol manufacture by catalytic hydrogenation of furfural, increases equipment processing capacity and product yield, and reduces energy consumption of coarse product refining, and has the advantages of saved investment, low energy consumption and simple and rapid process route.

Description

technical field [0001] The invention relates to the technical field of rectification, in particular to a continuous rectification method and device for refining furfuryl alcohol. Background technique [0002] Furfuryl alcohol is an important organic chemical raw material with a wide range of uses. It is mainly used to synthesize resins with various functions, cold-resistant plasticizers, fibers, rubber, and drugs; it can also be used as solvents, rocket fuels, etc. Furfuryl alcohol is mainly obtained by catalytic hydrogenation of furfural. The production of furfuryl alcohol has long been industrialized, and the process for producing crude furfuryl alcohol by catalytic hydrogenation of furfural is a continuous production process. However, the distillation and purification of crude furfuryl alcohol is still commonly used in China. Batch production process , that is to feed in a distillation kettle first, after distillation to remove the light components, continue to distill t...

AI Technical Summary

Problems solved by technology

Furfuryl alcohol is mainly obtained by catalytic hydrogenation of furfural. The production of furfuryl alcohol has long been industrialized, and the process for producing crude furfuryl alcohol by catalytic hydrogenation of furfural is a continuous production process. However, the distillation and purification of crude furfuryl alcohol is still commonly used in China. Batch production process , that is to feed in a distillation kettle first, after distillation to remove the light components, continue to distill to obtain the finished furfuryl alcohol, store the residue in a centralized manner, then feed again, and then distill, the whole distillation process has no reflux, in fact it is only a simple one-stage process distillation process

This intermittent distillation process has problems such as small processing capacity of a single set of equipment, low yield of finished products, large equipment investment, high energy consumption, and high labor intensity of workers.

In the process of producing furfuryl alcohol by catalytic hydrogenation of furfural in Rhone Poulenc Company of France, the refining of furfuryl alcohol adopts the "four towers" process (see "Modern Chemical Industry" No. 2, 1990, titled "Progress in Production Technology of Furfuryl Alcohol"), the so-called "four towers" That is, light component removal tower, furfural removal tower, refining tower and heavy component removal tower. Although this process can produce relatively pure furfuryl alcohol, it has not achieved continuous production. In addition to the above-mentioned shortcomings of the batch process, there are also energy sources Disadvantages of high consumption

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