The method of obtaining the oxidized vegetable oils

 

(57) Abstract:

The invention relates to a method for producing an oxidized vegetable oils, which are used as film-forming paints and lacquers, printing, light industry, binders in the construction industry and other sectors of the economy. Technical problem - getting bright oxidized vegetable oils in soft conditions, reducing the duration of the process. The production of oxidized vegetable oils is carried out in the blowing of the feedstock (vegetable oil) air at 130-150C in the presence of alyuminiiorganicheskikh connections: diethylaluminium, triethylaluminium, triisobutylaluminum at 130-150C, air flow 20 h-1. 3 table.

The invention relates to a method for producing an oxidized vegetable oils, which are used as film-forming paints and lacquers, printing, light industry, binders in the construction industry and other sectors of the economy [1] (A. Y., Grinberg "Technology of film-forming substances." L., Goskomizdat, 1955, S. 230-241).

A method of obtaining oksipolimerizatsija oils, which consists in blowing che is rantseva-lead or manganese-lead-cobalt), upon completion of flushing of the oxidized oil is supplied to the heat treatment without blowing air at a temperature 260-265oC or 280oC under vacuum. The disadvantage of this method is the high temperature heat treatment and the high duration of the process (after 5 hours start to take samples for determination of viscosity), which leads to losses of vegetable oil during its oxidation, increase harmful emissions into the atmosphere, worsening the quality of oxidate (darkening), the need to use lead-containing driers [1] (A. Y., Grinberg, ibid, S. 268).

A method of obtaining polymerized oils, comprising the following operations: blowing air at a temperature of 138oC followed by stirring at a temperature of 60oC with the addition of 0.4% diluted sulfuric acid, and upon reaching the desired viscosity neutralization with triethanolamine. The disadvantages of this method include a multi-stage process, the need for neutralization of sulfuric acid [2] (U.S. patent 2838551, 1958).

Closest to the present invention is a method of obtaining oxidized oils due to the catalytic polymerization of drying oils in the presence of metallic copper with delineate 160oC for 8 hours. The disadvantage of this process is the necessity of using a catalyst derived from an expensive metal, and high duration of process [3] (patent Poland 36594, 1958).

The purpose of this invention is to eliminate these drawbacks: the process under mild conditions, using available catalysts, eliminating mnogostadiinost and reducing the duration of the process and, as a consequence, obtaining light oxidized oils.

This goal is achieved by carrying out the oxidation semidrying vegetable oils oxygen at a temperature of 130-150oC in the presence of alyuminiiorganicheskikh compounds (AOC): diethylaluminium (DEAH), triethylaluminium (tea), triisobutylaluminum (CHIBA).

The use of these compounds allows you to:

1. to reduce the duration of the process up to 6-8 hours, in this case is not required to conduct additional heat treatment at elevated temperatures as in [1] (A. Y., Grinberg, ibid, S. 264-267) or pre-exposure at a temperature of 160oC as in [3] (patent Poland 36594, 1958),

2. to carry out the process in one stage,

3. to avoid skin is the use of catalysts based on precious metals (copper),

5. get oxidized oil with low chromaticity, as the process is carried out in mild conditions, as well as in the present invention do not require the use of painted catalysts (siccatives).

Selected alyuminiiorganicheskikh connection will probably play the role of initiator in the polymerization of unsaturated vegetable oils and catalyst redox process occurring during the oxidation of vegetable oils.

The proposed method is confirmed by the following examples.

Example (other 3 tables. 1)

In a glass reactor bubble type load 1000 g of vegetable oil (technical sunflower oil) and 71 ml of 20% solution of tea in heptane (1.0 % wt.) heated to 130oC and begin to pass the oxidizer is air. Air flow support equal to 20 h-1. Monitoring the progress of the reaction is carried out with the viscosity of oxidized oil on the OT-4. The reaction is finished when reaching a viscosity of 2800 C. the Duration of the reaction is 6 hours, color by iodometric scale 50%-aqueous solution obtained oxidized oils in mineral spirit equal to 400.

The following examples, showing the influence of the concentration of Asli oxidized oil, held on the above methodology, are presented in table. 1.

Examples characterizing the influence alyuminiiorganicheskikh connection (DEAH, tea, CHIBA) on the duration of response and quality of the oxidized oil, are presented in table. 2.

Examples demonstrating the impact of oil on the duration of response and quality of the oxidized oil, are presented in table 3.

Thus, the obtained results indicate that the oxidation of vegetable oils with oxygen at a temperature of 130-150oC and concentration alyuminiiorganicheskikh compounds in the range of 0.5-1.0% of a light oxidized oil. The most effective (the reaction rate is highest) as a catalyst (initiator) to use triethylaluminium.

List of used sources

1. Grinberg A. I. Technology of film-forming substances. - Leningrad: Goskomizdat, 1955. 651 S.

2. Pat. 2838551 USA. Polymerized vegetable oil and the way they are received / Cantor M., Wilson S. - 10.06.58.

3. Pat. 36594 Poland. The method of manufacture of polymerized oils / Gluchwski Century, J. Szczepanski 1.04.58.

The method of obtaining oxidized rastitelnyi of 0.5-1.0 wt.% alyuminiiorganicheskikh connection (diethylacetanilide, triethylaluminum, triisobutylaluminum) in the temperature range 130-150oWith the air blowing 20 h-1.

 

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