SU35182A1 - Production of diolefins from alcohols - Google Patents

Description

In the scientific and patent literature for the obtained diolefniums, methods have been proposed in which alcohols mixed with other substances, such as aldehydes, etc., when heated with suitable catalysts, give two-ethylenic hydrocarbons. On the other hand, it is known that the vast majority of organic compounds of various classes, for example, limiting, unsaturated, and aromatic hydrocarbons, alcohols, aldehydes, ethers of simple and complex, etc., form pyrogenetic decomposition at a red-heat temperature and form small amounts of divinyl.

Ethyl alcohol NS is an exception and when pyrogenetic decomposition always forms a small amount of divinyl, Ipatiev mentions this for the first time (L. G. Pr. Ch. (2) 67 421 (1903). He passed alcohol vapors through a red-hot red glass tube with aluminum powder. It follows from the Ipatiev figures that he received around O. divinyl and spent alcohol.

The author observed that when alcohol is passed through glass, porcelain, quartz, copper, iron tubes, they are empty or filled in very different ways (40)

figurative materials (pieces of broken glass, lemza, clay, coal, aluminum shavings, etc.) always produce divinyl in quantities close to the yield obtained by Ipatiev in the above cited work. Thus, by passing 100 g of alcohol for 80 minutes through tubes at 600 °, the following amounts of divinyl are obtained for nponyuieu alcohol:

(L1 N1111I .1L

1.Pustppp zh; and; lma trubkl 0,1%

2. Iron pipe. TI.IM or glass and glassware 0.2% L. D Slan is empty. . . . . . 0, (i ,,%

4.Median) CP. Iacolpspia U pieces of glass 2 ml. 0.1%

5.Median tube filled with RSANI a.iioMHiiiioiKitt 1 | 101 days; 1M, 1 .ir.ir 0.1%

6. Ulla l tube, semi-nickel aluminum ii pl%

7. Median grubkp. Napolimía with a regular fliridig O.fl%

On the other hand, English Patent No. 17235 (1912) states that butadiene can be obtained from one butyl alcohol, and butadiene homologs from homologues of butyl alcohol by heating them with suitable catalysts. Butyl alcohol or

his homologs lose the molecule of field II, the molecule of noloro and transfer to butalnsp or its homologues, preserve the carbon chain of the atom of butyl alcohol or its homologs, according to the author’s author 1: can be obtained by good pyhols of mediators from spirits with a number of carbon atoms, less than carbon-containing 2 di-ethyleneopes, by iiaipeiia. their corresponding catalyst.

Catalysts: single-lamination and single-component cleavage agents, for example, uranium oxide or a mixture of water-splitting substances, with hydrogen-dissociating agents, for example, a mixture of alumina and zinc oxide. Mixtures of this type are sometimes found in nature. These are mixtures of aluminum hydrosilicates and other metals with carbonates or oxides to dmp, zinc, manganese, etc. For ethyl alcohol, for example, with a well-chosen catalyst, divinyl is the main product of the reaction and its outputs exceed the spent alcohol.

The reaction proceeds according to the equations:

2C, lIr, OIIr .-- 2HjO-f And ..- 1-С, Po

3 C.lfjOII years- 3ILO H-IGN-C “H, in itd

The first of these reactions is important, the rest are secondary.

The byproduct of the reaction is the corresponding diolefins, olefins and other products. The amount of olefins can be adjusted. So, the introduction of alcohol into the catalyst or catalyst,

        ., - t

; V ..-,:,,.

melting the hydrogenation process, leads to a decrease in olefins.

An example. Ethyl alcohol 95 is passed through a quartz tube filled with a mixture of floridine (aerated duster catalyst) with zinc dust (iodine removal catalyst (at 410. and other gases are transferred to a vessel with bromine. Bromides liberated from excess bromine are distilled. A small amount of distilled ethylene bromide and pseudobutyl bromide is distilled. The residue is almost pure. Divinyl tstrabromide with a melting point of 110 °.

Divinyl from bromide is regenerated by zinc in an alcohol solution. Taking into account the use of alcohol, the output is more

....

The subject matter of the invention. ,

1. A method of producing divinyl by the action of catalysts at elevated temperature and normal or reduced pressure on vapors of ethyl alcohol, which are distinguished by the fact that as a catalyst, a mixture of dehydrating and dehydrating catalysts is used.

2. Acceptance of the method according to p. 1, except that the vapors of the original ethyl alcohol are diluted with indifferent vapors and gases.

3. Acceptance of the method according to p. L. 1 and 2, characterized in that the reaction products are subjected to rapid cooling. . .U