Novel process for removing light components in stock solution of furfural and special production apparatus

Abstract

The invention relates to a novel process for removing light components in the stock solution of furfural and a special apparatus matching with the same. The novel process comprises the following steps: heating a column bottom to allow the temperature of the column bottom to rise to 100 to 105 DEG C; delivering the stock solution of furfural into a special light component removing column through a feed inlet, maintaining the temperature of the column bottom to be 100 to 105 DEG C, the pressure of the column bottom to be 0.1 to 0.2 kg/cm<2>, tower top temperature to be 65 to 70 DEG C and a reflux ratio to be 1: 20, and cooling a light component removing stock solution to a temperature of 70 to 80 DEG C through two steps. A tower section II at the upper part of the special light component removing column is smaller than a tower section I at the lower part of the special light component removing column; the feed inlet is connected with a stock solution storage tank through a pipeline; a fraction outlet is connected with a condenser through a pipeline; the condenser is connected with the upper end of a liquid separator through a pipeline; the liquid separator is respectively connected with a reflux opening and a storage tank through pipelines; a discharge outlet is sequentially connected with a cooler, a condenser II and a buffer tank through a pipeline. According to the invention, more than 95% of light components in the stock solution of furfural are removed, and total yield of furfural is increased by about 5%.

Description

technical field [0001] The invention relates to furfural production technology, in particular to a new process for removing light components from furfural stock solution and a matching special device. Background technique [0002] As the world's largest producer of furfural, my country's furfural production accounts for 3 / 4 of the world's output. At present, my country's furfural production technology is still relatively backward, basically staying at the level of the 1940s, and there is a certain gap with developed countries. Mainly manifested in: the light components are not separated in the furfural production process, and participate in the whole process from furfural distillation to furfural refining, the concentration of light components at the top of the tower is high, and the concentration of furfural is also high. It will polymerize with furfural and reduce the yield of furfural by about 5%. The serious loss of furfural results in low crude aldehyde rate and low r...

AI Technical Summary

Problems solved by technology

Severe loss of furfural results in low crude aldehyde rate and low refining rate, which reduces the production efficiency of furfural

In the rectification process, the light components are discharged as the front fraction mixed with water aldehyde. Many manufacturers want to use the primary distillation tower to recover furfural in water aldehyde, but because water aldehyde contains light components, the result affects The operation of the initial distillation tower is not successful; if the light component is discharged together with the water aldehyde as the front fraction, it will cause serious pollution to the environment

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