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Refining method for toluene containing nitrogen and olefin

A refining method and toluene technology, applied in organic chemistry, adsorption purification/separation, etc., can solve problems such as inability to remove olefins, and achieve the effects of reducing refining costs, prolonging service life, and reducing dosage

Active Publication Date: 2006-04-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to remove nitrogen-containing impurities in toluene, CN1142127C uses sulfonic acid cationic resin to refine toluene under the conditions of room temperature to 80°C and a linear flow rate of less than 10 m / h. Although a good denitrification effect can be achieved, it cannot be removed Olefins in Feedstock

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1～7

[0019] Following examples use the inventive method to carry out refining treatment to the toluene that contains morpholine.

[0020] Get 30 grams of macroporous styrene-sulfonic acid type cation exchange resin (Nankai University chemical plant product, model is D001), soak 30 hours with deionized water, be packed in the glass column, put 4 mass % of 4 times volume The hydrochloric acid solution passes through the resin for 1 hour to make it convert to the hydrogen form, then rinse the resin with deionized water until the pH of the eluate is 6.0-7.0, stop the rinse, remove the water with nitrogen, and dry it.

[0021] The toluene containing 56 μg / g morpholine impurities and 10 μg / g olefin content in terms of nitrogen content was passed through the above-mentioned hydrogen-type cation exchange resin column under different conditions, and then passed through the acid clay column, and the clay used was bentonite. The volume ratio of hydrogen-type cation exchange resin to acid clay...

example 8～14

[0023] Following examples use the inventive method to carry out refining treatment to the toluene containing morpholine, formylmorpholine and olefin.

[0024] Toluene containing 31 μg / g morpholine, 23 μg / g formylmorpholine and olefin content of 10 μg / g in terms of nitrogen content was passed through the hydrogen-type cation exchange resin column prepared in Example 1 under different conditions, and then passed through For the acid clay column, the clay used is bentonite, and the volume ratio of the hydrogen-type cation exchange resin to the acid clay is 3:1. See Table 2 for the treatment conditions and the nitrogen and olefin content in toluene after treatment.

example 15～19

[0026] The toluene containing morpholine and olefin is carried out refining treatment by the method for example 1, and difference is to change the volume ratio of hydrogen type cation exchange resin and acid clay in the process of treatment, and refining result is shown in Table 3.

[0027] example

[0028] example

[0029]

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PUM

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Abstract

The refine method for toluene contained nitrogen and olefin comprises, forcing said material through cation exchange resin at 10-60Deg and line flow rate 3-18m / h then acid clay layer. Wherein, the volume proportion of said resin and clay layer is 2.0-30.0:1. This method is simple, and has less pollution, low cost and well effect.

Description

technical field [0001] The invention relates to a method for refining nitrogen-containing toluene, in particular to a method for refining toluene containing nitrogen and olefin impurities. Background technique [0002] In the extraction process of aromatics using formylmorpholine as a solvent, the obtained toluene contains organic nitrogen impurities such as morpholine and formylmorpholine, the content of which is greater than 10 μg / g in terms of nitrogen content. Such high levels of nitrogen impurities can poison the catalysts of downstream processes, so they must be removed from toluene by refining methods to keep the nitrogen content of toluene below 1 μg / g after refining. [0003] At present, toluene containing impurities such as formyl morpholine is often refined by washing with clay and refining with clay. The water washing method consumes a large amount of water resources, which not only consumes a lot of energy, but also requires further treatment of the nitrogen-co...

Claims

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Application Information

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IPC IPC(8): C07C15/06C07C7/12
Inventor 杨玉蕊田松柏顾侃英
Owner CHINA PETROLEUM & CHEM CORP