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Method for preparing petroleum ether with chromatographic grade boiling range 60-90

A technology of petroleum ether and chromatographic grade, which is applied in the field of preparation of chemical reagents and can solve problems such as high purity difficulties

Inactive Publication Date: 2016-06-01
TIANJIN KERMEL CHEM REAGENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, petroleum ether with a boiling range of 60-90 is mostly washed with 98% sulfuric acid in the production process, and it is difficult to achieve high purity. Therefore, it is very important to find a new process for preparing petroleum ether with a chromatographic grade boiling range of 60-90. important production practice

Method used

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  • Method for preparing petroleum ether with chromatographic grade boiling range 60-90

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Embodiment 1

[0016] A preparation method of petroleum ether with a chromatographic grade boiling range of 60-90, the specific preparation steps are as follows:

[0017] (1) Adopt the chlorosulfonic acid of low content (the chlorosulfonic acid of content 3%) to join in the sherwood oil of technical grade boiling range 60-90 at stirring and temperature control 12 ℃, wherein, the quality of chlorosulfonic acid and sherwood oil The ratio is 1:10;

[0018] (2) Stir for 70 minutes, wash with water, discard the lower sediment, and obtain the upper liquid;

[0019] (3) Adjust the pH to 7 with 25% NaOH aqueous solution and wash the upper layer liquid with alkali. After removing water, leave the supernatant liquid and fractionate under NaOH conditions to obtain petroleum ether with a chromatographic grade boiling range of 60-90.

Embodiment 2

[0021] A preparation method of petroleum ether with a chromatographic grade boiling range of 60-90, the specific preparation steps are as follows:

[0022] (1) Adopt the chlorosulfonic acid of low content (the chlorosulfonic acid of content 2%) to join in the sherwood oil of technical grade boiling range 60-90 at stirring and temperature control 0 ℃, wherein, the quality of chlorosulfonic acid and sherwood oil The ratio is 1:12;

[0023] (2) Stir for 80 minutes, wash with water, discard the lower sediment, and obtain the upper liquid;

[0024] (3) 25% NaOH aqueous solution adjusts the pH to 8 and alkali washes the upper layer liquid, leaves the supernatant liquid after dehydration and fractionates under NaOH conditions to obtain petroleum ether with a chromatographic grade boiling range of 60-90.

Embodiment 3

[0026] A preparation method of petroleum ether with a chromatographic grade boiling range of 60-90, the specific preparation steps are as follows:

[0027] (1) Adopt the chlorosulfonic acid of low content (the chlorosulfonic acid of content 5%) to join in the sherwood oil of industrial grade boiling range 60-90 at stirring and temperature control 15 ℃, wherein, the quality of chlorosulfonic acid and sherwood oil The ratio is 1:8;

[0028] (2) Stir for 60 minutes, wash with water, discard the lower sediment, and obtain the upper liquid;

[0029] (3) Adjust the pH to 7 with 25% NaOH aqueous solution and wash the upper layer liquid with alkali. After removing water, leave the supernatant liquid and fractionate under NaOH conditions to obtain petroleum ether with a chromatographic grade boiling range of 60-90.

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Abstract

The invention provides a method for preparing petroleum ether with a chromatographic grade boiling range 60-90. The method comprises the following steps: 1) employing low-content chlorosulfonic acid and adding the chlorosulfonic acid into the petroleum ether with an industrial grade boiling range 60-90 under a stirring state and the temperature controlled at 0-15 DEG C, wherein, a mass ratio of chlorosulfonic acid to petroleum ether is 1:8-12; 2) stirring the materials for 60-80 minutes, washing the materials by water, removing a precipitate at the bottom to obtain an upper layer liquid; and 3) using 25% of a NaOH aqueous solution for adjusting a pH value to 7-8, and performing alkali washing on the upper layer liquid, anhydrating and keeping an upper layer clear liquid, and fractionating the upper layer clear liquid under NaOH condition to obtain the petroleum ether with chromatographic grade boiling range 60-90. The purity of the petroleum ether with chromatographic grade boiling range 60-90 is high, the process is simple and reasonable, the product qualified rate is high, and the method is suitable for requirement of large-scale industrial production.

Description

technical field [0001] The invention relates to a method for preparing chemical reagents, in particular to a method for preparing petroleum ether with a chromatographic grade boiling range of 60-90. Background technique [0002] Petroleum ether is a light petroleum product with a boiling range of 30-150°C. The temperature range for collection is generally around 30°C. Generally, there are boiling range specifications such as 30-60°C, 60-90°C, and 90-120°C. It does not produce any smoke when completely burned. It can react with oxidants. After high-speed impact, flow, and agitation, it may cause combustion and explosion due to static spark discharge. Its vapor is heavier than air, and can spread to a considerable distance at a lower place, and it will ignite and burn back when encountering an ignition source. It is mainly used as a solvent and as an oil extractor. Its vapor and air can form explosive mixtures, which can cause combustion and explosion when exposed to open f...

Claims

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Application Information

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IPC IPC(8): C07C7/00C07C9/14C10G53/12
Inventor 王家濬
Owner TIANJIN KERMEL CHEM REAGENT