Process and equipment for preparing chloropentane

Abstract

The invention discloses a process for preparing chloropentane. The process comprises the steps: hydrolyzing phosphorus trichloride, performing isopentene addition and recovering hydrogen chloride gas. The process is characterized in that the process of hydrolyzing phosphorus trichloride comprises the substeps: adding diluted hydrochloric acid with the mass percentage of 3-5 percent and phosphorus trichloride into a reaction kettle for reacting, wherein the reaction temperature is 30-50 DEG C, and the reaction time is 4 hours; the process of performing isopentene addition comprises the substeps: contacting isopentene and hydrogen chloride gas for reacting, wherein the gas flow velocity is 150m<3>/h, the reaction temperature is 5-10 DEG C, and the reaction time is 20-30 seconds; and absorbing excessive hydrogen chloride gas through a hydrochloric acid absorption tower to be used for hydrolyzing phosphorus trichloride again. The process has the beneficial effects that the phosphorus trichloride hydrolysis condition is adjusted to the temperature of 30-50 DEG C and the reaction time of 4 hours, the problems that heat release is extremely fast and the gas release amount is instable in the reaction process are effectively solved, the potential safety hazard is eliminated, a good reaction basis is provided for subsequent addition, the content of by-product phosphorous acid is over 99 percent, the yield is improved to over 99 percent, and the economic benefits are considerable.

Description

technical field [0001] The invention relates to a preparation process and equipment of chloropentane, which belongs to the technical field of chemical industry. Background technique [0002] Pinatone is mainly used in the production of triazole pesticides, and is also used in the production of herbicides and pharmaceutical products. It is one of the important chemical raw materials. In the preparation process of pinatone, chloropentane is a very important intermediate. [0003] In the existing process for preparing pentane chloride, the hydrochloric acid addition process is usually used, that is, quantitative isopentene reacts with excess hydrochloric acid at 5±2°C, and the hydrochloric acid addition time is usually 2.5-3h , After the dropwise addition is completed, it needs to be kept warm for 2h. Because the addition of hydrochloric acid in this process is too large, a large amount of waste acid is produced, resulting in difficult post-treatment, and the production effic...

AI Technical Summary

Problems solved by technology

However, in actual production, the process of hydrolyzing phosphorus trichloride to generate phosphorous acid releases heat too quickly, and the amount of hydrogen chloride gas released is unstable. Produce certain influence, thus have influenced the content and productive rate of pentane chloride, so also need to improve above-mentioned technique

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