The method of purification of the products of the alkylation of benzene with olefins

 

(57) Abstract:

Usage: in chemical synthesis in the production of alkyl benzenes by the alkylation of benzene with olefins in the presence of a catalyst complex of aluminium chloride. The inventive cleaning products from alkylation of chlorine-containing impurities include water washing, sludge separation of aluminum chloride from the alkylate, processing alkylate alkali solution at 76 - 85oC for 40 - 60 min when the alkali concentration in the alkylation of 0.1 - 0.25 wt.% and subsequent washing. table 1.

The invention relates to a technology for production of alkyl benzenes in the presence of a catalyst in the form of an ORGANOMETALLIC complex of aluminium chloride and can be used in the washing of the catalyst, the decomposition of chlorinated organic compounds and neutralizing alkylates.

A known method of purification of the products of the alkylation of benzene with olefins from the catalyst complex of aluminum chloride by water washing using 1-20 weight. water from the weight of the products of alkylation (1).

Closest to the invention on the technical solution and the achieved result is a method of cleaning products alkilirovan the ie).

The washed alkylate from the catalyst complex water, which is taken in a quantity of 50 to 100 by weight of the alkylate, water after sludge is sent for treatment prior to discharge into the reservoir, and acid alkylate is neutralized with alkali and washed residues from alkali water.

The disadvantage of this method is that the alkali is neutralized and only the remnants of free hydrogen chloride and aluminium chloride, and chlorinated organic compounds remain in the alkylate.

In the process of rectification of alkylate under the influence of increased water temperature organochlorine compounds undergo hydrolysis with the release of hydrogen chloride, which causes corrosion of the equipment.

The aim of the invention is to reduce corrosion of the devices in the system rectification alkylate, simplifying cleanup.

The objective is achieved by the described method of cleaning products of the alkylation of benzene with olefins from the catalyst complex of aluminium chloride by water washing using 1-20 weight. water (1) from the weight of the products of alkylation and subsequent thermal hydrolysis of chloro-organic compounds and neutralizing alkylate alkali at a temperature of 76 85oC, the concentration of alkali in al the significant features of the process are carrying out hydrolysis of organochlorine compounds and neutralizing alkylate at a temperature of 76 - 85oC, the alkali concentration of 0.1 to 0.25, reaction time 40 60 min.

The invention consists in the following. In the process of alkylation of benzene with propylene in the presence of a complex of aluminium chloride in the number of adverse reactions is the reaction of chlorination of organic compounds. Ions of chlorine, hydrogen chloride in the system alkylation stand out from the catalyst complex under the influence of moisture entering the system with benzene, and high temperature. Ions of chlorine, hydrogen chloride can be attached to the alkyl benzene, propane, propylene and its oligomers, for benzene.

An example of a typical reaction accession

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For alkyl benzenes most preferred reaction substitution in the side chain

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In the process of rectification under the action of moisture, high temperature organochlorine compounds undergo hydrolysis with the release of hydrogen chloride.

Hydrolysis of chloro-organic compounds of moisture occurs on the slow reversible reaction. This creates a corrosive environment in technological devices in the system rectification.

Hydrolysis of chloro-organic compounds in the sample chloropropylene passes through reach plays the role of catalyst for the reaction of hydrolysis of chlorinated organic compounds at elevated temperature and simultaneously binds emitted from the reaction of hydrolysis of chlorine.

Example 1 (comparison). In a separating funnel, pour 100 g of alkylate containing 0.2 wt. aluminium chloride as catalyst, and 50 grams of water. The contents of the funnel are intensively mixed and rasclaat within 60 minutes After stratifying the remainder of the aluminum chloride in the alkylate is 0,003% chlorine content in the form of organochlorine compounds 0,0077% recovery of aluminum chloride from the alkylate 98,5% Then in a separating funnel take 90 grams of the washed alkylate containing aluminium chloride 0,003% chlorine in the form of organochlorine compounds 0,0077% add 0.9 g of 10% aqueous sodium hydroxide solution, strongly shaken and rasclaat within 60 minutes After stratifying the washed alkylate from salts and alkaline water, which is taken in the amount of 20% by volume. Aluminum chloride, hydrogen chloride washed in the alkylate is missing, and the chlorine content in the form of organochlorine compounds defined 0,0075%

Example 2. In a flask with a stirrer and a jacket for heat from thermostat take 90 grams of the washed water from aluminium chloride, as in example 1, alkylate content of chlorine in the form of organochlorine compounds 0,0075 wt. add 1.8 g of 10% aqueous sodium hydroxide solution. The temperature of the mixture is brought to 80oC and incubated for those who practical connections. The chlorine content was 0,0003% recovery 96%

Example 3. In a flask with a stirrer and a jacket for heat from thermostat take 90 grams of the washed water alkylate content of chlorine in the form of organochlorine compounds 0,0075% add 0.9 g of 10% aqueous sodium hydroxide solution. The temperature of the alkylate lead up to 76oC and incubated for 40 minutes Then alkylate is cooled, washed of salts and alkali water and determine chlorine in the form of organochlorine compounds. The chlorine content was 0,00022% Degree of purification 97.1% of

Example 4. In a flask with stirrer and heating thermostat take 90 grams of the washed water alkylate content of chlorine in the form of organochlorine compounds 0,0042% add 2.25 g of 10% aqueous sodium hydroxide solution. The temperature of the alkylate is brought to 85oC and incubated for 45 minutes Then alkylate is cooled, washed of salts and alkali water and determine chlorine in the form of organochlorine compounds. The chlorine content was 0,0003% Degree of purification 92,86%

The results of the experiments presented in the table.

The method of purification of the products of the alkylation of benzene with olefins in the presence of a catalyst complex of aluminium chloride from chlorinated compounds by water washing followed the Department is that the processing of alkylate the alkali solution is carried out at 76 - 85oWith over 40 to 60 min at a concentration of alkali in the alkylate 0,1 0,25.

 

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