Production of isooctaacid by composite catalytic method

Abstract

Production of isooacid by composite catalysis is carried out by placing isooctanol and sodium hydrate solution into reactive kettle in proportion=1.2-1.5mol, agitating, adding into composite catalyst with calcium oxide 0.8-1.2 unit mass, vanadic anhydride 0.6-0.9 unit mass and rare earth oxide 0.1-0.4 unit mass, agitating, raising temperature to 240-280 degrees C, alcohol and alkali oxidization reacting for 1.8-2.2hrs, removing hydrogen gas, cooling for reactive materials, adding into 5-10% water to dilute, filtering out solid composite catalyst, adding into H2SO4 solution with content 30-40% to make materials pH value become 3, agitating while acidification reacting for 30-40mins, laying aside while laminating to remove aqueous layer, washing materials by water, decompressing and dewatering to obtain final products. It is cheap, has higher recovery rate and short process flow.

Description

technical field [0001] The invention relates to a process for preparing isooctanoic acid, more specifically to a new process for preparing isooctanoic acid by using a composite catalytic method, which is suitable for the industrial production of isooctanoic acid by utilizing isooctyl alcohol. Background technique [0002] Isooctanoic acid, scientific name 2-ethylhexanoic acid, English name: 2-Ethylhexanoic acid, chemical structural formula: Molecular weight: C 8 h 16 o 2 =144.21, colorless oily liquid, soluble in ether, slightly soluble in ethanol, liquid with mild odor. It is a fine chemical product, isooctanoic acid has been widely used in many industries and fields. In the pharmaceutical industry, isooctanoic acid is the raw material for the manufacture of ampicillin and carbenicillin; in the paint industry, salts of isooctanoic acid such as cobalt, manganese, lead, zinc, calcium, zirconium, aluminum, and rare earth are used as paint drier and unsaturated polyester ...

AI Technical Summary

Problems solved by technology

[0006] Disadvantages: poor oxidation catalytic effect, low product yield (65-70%), long process flow, side reactions, large consumption of raw materials, certain corrosion to equipment, high cost, and low performance indicators of the obtained products, so there is no possibility of large-scale production sex

[0010] Disadvantages: Nitric acid is highly corrosive, requires high anti-corrosion equipment, requires large equipment investment, and releases harmful gas NO during the reaction process, which is easy to produce esterification and must be hydrolyzed to obtain carboxylic acid, which increases the complexity of the process, so it is not easy Realize large-scale production

[0015] Disadvantages: The reaction requires high temperature and high pressure, difficult operation, serious equipment corrosion, strict equipment requirements, increased engineering investment, and difficult to achieve large-scale production

[0020] Disadvantages: the process is long, the product yield is low (about 75%), catalyst recovery is difficult, raw materials and energy consumption are large, the performance index of the obtained product is low, and there is no possibility of large-scale production

[0025] Disadvantages: Due to the existence of two processes of esterification and saponification, this method reduces the utilization rate of isooctyl alcohol, and at the same time increases the product cost due to the rectification process. This method is rarely used in industry

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