SU571473A1 - Method of preparing lythium acrylate - Google Patents

Description

I

This invention relates to methods for producing organometallic compounds, a (lithium acrylic acid, lithium salt).

The known method of producing alkali salts of acrylic acid is the interaction of methyl or ethyl acrylic acid preheated to 30-50 ° C with 10-15% -HbtM aqueous sodium hydroxide, potassium hydroxide or caustic, preheated gy ZO-90 C. React: proceeds at 60-15 ° C for 1-10 minutes Then the reaction products are saponified by adding an alkali ester and an alkali solution at a pressure of 0.5-3.5 kg / cm and a temperature of 9O-1O5 C l. This method provides a 99.5% degree of interaction.

The disadvantages of this method are carrying out the reaction at elevated temperature; nevomazhnost, receiving acrylate. in its pure form due to the presence of polymer products, hydroquinone and the starting components; two-step production process.

With a chain of increasing the yield of the degree of purity of the target product on the proposed

The lithium carbonate method is reacted with acrylic acid at a molar ratio. 1: 1 - 2, respectively, and the temperature O-25 C in the environment of the lowest up canopa,

 The use of an excess of acrylic acid allows quantitative conversion of all lithium carbonate to lithium acrylate. The latter is especially important when obtaining acrylate .0 lithium isotopic composition. To remove water and excess acrylic acid, for example, K1chl alcohol is added to the reaction mixture and the solution is passed through an alumina column. Processing with

and alumina can be replaced by washing the finished product with acetone or normal hydrocarbons.

Lithium acrylate is very well soluble in acrylic acid, water, slightly worse in ethyl and methyl alcohols, practically insoluble; in ether, acetone, benzene, 1-styrene,, normal hexane and heptane.

PRI me R 1. To a mixture consisting of

Claims (2)

25 14 ml of acrylic acid, which is crushed with water in a ratio of 1: 2, and 30-40 ml of methyl alcohol, while 7.4 g of lithium carbonate are added while stirring with ice over 1 hour with stirring. After the termination of rapid gas evolution, the reaction mass is maintained at a commanding temperature to completely remove iipviNiepno carbon dioxide for 0.5 hour (pH of medium e). Then the reaction mixture is passed through a column with alumina of the main treatment. The eluate with a pH of 7 is transferred to Petri dishes and left in a vacuum desiccator over various desiccants. The target product is dried with a constant weight, periodically pumping out a desiccator and shift dryers. Acrylate pity is obtained with a yield of 05% (for pure product). P JJ and me 2. To 14 ml of acrylic acid diluted with water in a ratio of 1: 2, while cooling with ice and stirring for 1 hour, add 7.4 g of lithium carbonate. After the termination of the evolution of carbon dioxide, the solution is filtered. The filtrate is left in a vacuum 9 under desiccants. Another wet product from a desiccator is transferred to a filter, washed with acetone and dried. The yield of the target product is 95% (per cent product). Found,%: From 4 € i, O7, 46.2О, Н 4, ОО, 3.78, tie, 64, 8.75. CjHjOjLi. Calculated,%: C 46.16; H 3.88; Li 8.89. Claims method for producing lithium acrylate, characterized in that lithium carbonate is reacted with acrylic acid at a molar ratio, respectively, and a temperature of -25 ° C in a lower alkanol environment. Sources of information taken into account in the examination: 1. Japan patent No. 31О85 / 73, cl. 16 B 63171.1973.