SU556134A1 - Method for dehydration of synthetic fatty acids c5-c6 - Google Patents

Description

one

The invention relates to the field of dehydration of synthetic fatty acids obtained by the oxidation of paraffinic hydrocarbons with atmospheric oxygen and used in the petroleum refining and petrochemical industries.

A known method for separating water from Cs-Sb acids obtained by distilling aqueous synthetic Cs-Gas fatty acids by mechanical settling in tanks for 10-12 hours at a temperature of 30-40 ° C

one.

However, in this method, due to the strong connection of the emulsion of acids with water, the quality of the separation of water is unsatisfactory and its content in acids after sludge is about 5%. In addition, the process is time consuming.

The purpose of the invention is to increase the degree of dehydration of synthetic acids GS-GG and the rate of sedimentation.

This goal is achieved by settling in the presence of a demulsifier at an initial temperature of 80-90 ° G. The demulsifier is preferably used soap glue in the form of a 10-30% aqueous solution of sodium salts of G4-G2g acids, containing soda ash 1-3%, sodium alkali 0.1-0.5%.

With a decrease in the content of alkaline components in a soap glue, the process of settling deteriorates, with an increase in their content to 5 and 1%, respectively, a deterioration of settling is not observed, and the loss of acids increases.

The addition of the demulsifier to the acids is better done at a temperature of 80-90 ° G, however, the subsequent settling is preferably carried out without further heat supply.

The proposed method of dehydrating the acids of the GS-Ge fraction will make it possible to almost completely remove water from the acids and reduce the dehydration time by 4 times.

The dehydration of the acids is carried out as follows.

To the acids of the GS-Ge fraction are added up to 1% of soap glue, stirred, and the mixture is left to stand at a temperature of 80-90 ° G for 2-3 hours.

Claims (2)

Example 1. To 100 weight. including the acids of the GS-Ge fraction with a moisture content of 6-8%, an acid number of 420-450 mg KOI / g, an ester number of 0.5-1 mg KOH / G, 0.1 and 1 weight is added. including soap glue and stirred for 5 minutes, then the mixture is set aside for 2-3 hours at a temperature of 80 ° G, the lower layer is separated from the GS-Ge acids and their moisture content is determined. The results of the separation of moisture acids Cs-CG are shown in the table. As can be seen from the table, moisture is almost completely removed from the acids. The quality indicators of acids in terms of acid and ether numbers remain almost unchanged. The presence of soap glue in acids was not detected. Example 2. To 100 weight. including the acids of the Sb-Sb fraction with a moisture content of 8%, an acid number of 430 mg KOH / G, an ether number of 0.6 mg KOH / G at a temperature of 80-90 ° C add 1 weight. including soap glue of 25% concentration with an alkali content of 0.05%, soda content of 0.6% and stirred for 5 minutes, then the mixture is settled for 2 hours and the bottom layer is separated from the SB-Ce acids. The moisture content of the dehydrated acids is 3.5%, the acid number is 432 mg KOH / g, the essential value is 0.7 mg KOH / g, the soap content is absent, i.e., the acid quality characteristics Sat-Sat have not changed. Pr-imer 3. K 100 weight. including the acids of the Cs-Sat fraction with the characteristic as in Example 2, 80-90 ° C. add 1 wt. including soap glue 27% concentration with an alkali content of 0.4%, soda ash 2.2% II mixed with 5 microns. After settling the aqueous layer for 2 hours, dehydrated acids with a moisture content of 0.3% are obtained, the quality indicators of the Co-Sat acids remain almost unchanged. Example 4. To 100 weight. including Cs-Cg acids with the same characteristic as in the previous examples, at a temperature of 80-90 ° C add 2 weight. including a 36% strength soap lacquer with an alkali content of 1.5%, soda ash 5%, mixed and settled under the same conditions as in the previous examples. The moisture content of the dehydrated acids is 0.3%, the acid number is 400 mg KOH / g, the ester number is 0.6 mg KOH / g, and the presence of salts of fatty acids is detected in the acids. Claim 1. Method for dehydration of synthetic fatty acids Sb-Sb with mechanical heating settling, characterized in that, in order to increase the degree of dehydration and delamination rate, settling is carried out in the presence of a demulsifier at an initial temperature of 80-90 ° C. 2. A method according to claim 1, characterized in that, as a demulsifier, a soap adhesive is used in the form of a 10-30% aqueous solution of sodium salts of C4-Css acids containing soda ash 1-3% and sodium alkali 0.1- 0.5%. Sources of information taken into account in the examination: 1. B. S. Alaev, N. K. Maikovska, A. M. Shiman. Production of synthetic fatty acids. M., “Pishepro.mizdat, 1960, p. 66 (prototype).