SU1004330A1 - Process for purifying products of alkylation of benzene with ethylene from aluminium chloride - Google Patents

Description

This invention relates to an improved process for the purification of alkylation products of benzene with ethylene from aluminum chloride and may be used in the manufacture of ethylbenzene.

A known method for purifying aromatic hydrocarbons from polar impurities by contacting technical hydrocarbons with zeolites 1.

However, this method is inefficient when cleaning hydrocarbons from aluminum chloride.

A known method of purification of the products of alkylation of benzene with ethylene from aluminum chloride by three-step washing of the alkylate with water, aqueous alkali and aqueous ammonia solution 2.

However, in this method, the use of alkalis, the use of special equipment, the formation of wastewater complicates the overall technological design of this production.

The closest to the invention to the technical essence and the achieved result is a method of cleaning the products of alkylation of benzene with ethylene from aluminum chloride by

contacting them with an anion exchange resin 3.

The disadvantages of this method are the relatively small dynamic capacity of the anion exchanger and the need to use aqueous solutions of alkalis to regenerate the anion exchanger.

The purpose of the invention is to increase the efficiency of the process by increasing the dynamic capacity of the ion exchanger and the possibility of regeneration with water.

Fasting, Lenna goal is achieved by the fact that according to the method of purification of the products of alkylation of benzene with ethylene from chloride chloride with ion exchanger, macroporous KU-23 sulfonic cation exchanger in hydrogen form is used as ion exchanger.

20

The proposed method allows a 3.6-fold increase in the cleaning efficiency of the alkylate-from aluminum chloride with a degree of purification of 100%. In the amount of 4; 1 (by volume) to the cation exchanger KU-23 is used as a regenerating agent.

The method is carried out as follows and compared with anion exchange AB-17.

Example. The production of alkyl benzene with benzene by ethylene containing

0,459 g / l of alnmini chloride, passed through a column with cation exchanger KU-23 (or K-2-8) in the amount. 1.2 g in terms of dry substance. The diameter of the column is 10 mm. The test was carried out until the ions of aluminum exited at the outlet of the column.

Similarly, the experiment was carried out with an / 1 ITOM AV-17 in OH form.

The resultant test of ion-exchange purification of alkylates from aluminum chloride is given in Table. one.

From tab. 1 it follows that the amount of purified product by the proposed method is more than 3.6 times the amount of alkylate purified by a known method. One volume of cation exchanger KU-23 is capable of cleaning 605 volumes of alkylate with a concentration of 0.459 g / l of aluminum chloride versus 170 volumes, according to the prototype.

To determine the required number of regenerating solutions, the desorption of aluminum chloride from ion exchange resins is carried out in separate portions in the ratio of ion exchanger: regenerant equal to Isl in each portion. The results of the experiments are presented in Table 2.

The degree of desorption of aluminum chloride during regeneration and the results of the experiments are presented in table. 2

As can be seen from the table. 2 for the regeneration of cationic KU-23 to 98% of sufficiently 4 servings of water, whereas by the known use of a 10-fold volume of sodium hydroxide solution leads to a desorption rate equal to 96.2%. For a more complete regeneration of the anion exchanger (up to 98%) and to remove residual alkali from the ion exchanger, additional washing is necessary with water at a specific ratio of 1:10. Thus, the total amount of regenerant by a known method is 5 times greater.

In addition, as follows from the table, the use of KU-23 for the adsorption of aluminum chloride from alkylate improves the efficiency of the process by increasing the capacity.

Table 1

605: 1

2120 170: 1 592

756

215: 1

92.2 96.8 97.7 98.2 98.25

On KU-23 Water On AV-17 10% solution of alkali-: chi 59.7 68.8 72.0 76.6

8.2

4: 1 (Water)

10: 1

5.1

(10% solution of alkali).

4: 1

6.5 (Water)

T a b l and 2 79.3 88.4 90.5 95.9 96.1 96

J 1004330

Claims (3)

Invention Formula Sources of Information taken into account in the examination. The method of cleaning the products of benzene alkylation with ethylene chloride. 1. USSR author's certificate aluminum by contact. 147178, class, C 07 C 07/13, 1961.. cloth and aluminum chloride with 2. USSR author's certificate ion exchanger, different 707902, cl. From 07 to 07/13, 1977. in order to increase the effect. process, as an ion 3. USSR author's certificate that use macroporous sulfo- 295741, cl. C 07 C OT / 12, 1968 cation exchanger KU-23 in hydrogen .10 (prototype).  .