Exact filtration for refining furfuryl alcohol, continuous distillation composite technique and device for the same

Abstract

The invention relates to a composite precise filtering and continuous rectifying method for furfuryl alcohol treatment and a device to carry out the same. The method is to remove solid impurity in crude furfuryl alcohol by precise filtering, and to remove light ingredient with boiling point lower than furfuryl alcohol by continuous rectifying. The device comprises a precise filter and a continuous rectifying tower. The precise filter is connected with the continuous rectifying tower by a middle storage tank, a material pump, a valve and a seal pipeline; an feeding inlet is arranged on the precise filter; a circulation pump and a heat exchanger are arranged on the top of continuous rectifying tower and a reboiler is arranged at the bottom of the continuous rectifying tower; the continuous rectifying tower is provided with a product outlet. The invention realizes a continuous production technology of treating fine furfuryl alcohol by catalytic hydrofinishing and improves equipment handling capability and product yields, a vacuum rectifying device with a pump for cycling temperature reduction is chosen in the composite precise filtering and continuous rectifying technology, thereby reducing the pressure drop pf the whole tower and preventing material from coking to block equipment due to overtemperature.

Description

technical field [0001] The invention relates to the technical field of rectification of furfuryl alcohol, in particular to a compound process method of precision filtration and continuous rectification of furfuryl alcohol refinement and a device thereof. 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 fir...

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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