Method for synthesizing primary fatty acid amide and device of ammonia gas recovery and circulation

Abstract

The invention discloses a synthetic method of a primary fat amide and an ammonia recovery and cycle device thereof. The steps of the synthetic method of the primary fat amide are as follows: a fatty acid and the ammonia are taken as raw materials, and an amination is carried out by the catalysis of a catalyst at the reaction temperature of 160 DEG C to 210 DEG C, the reaction pressure is 0.1 to 0.4 MPa, the ammonia gas flow is 0.5 to 3.0m<3> / h and the reaction time is 8 hours to 26 hours; samples are taken out to analyze until the acid value of the free fatty acid is qualified (the acid value is less than 1.0 mgKOH / g); and the catalyst is filtered and separated by a filter, so as to obtain the primary fat amide. The ammonia recovery and cycle device consists of an ammoniation reactor, an ammonia arrestor, a condenser, a separator, an ammonia compressor, a tank, a dryer, a buffer, a flow meter and the filter. The method and the device lead the consumption of the ammonia per ton to be less than 110 kg, which is greatly lower than the ammonia consumption of the traditional technology (more than 1200 kilograms per ton), and the consumption of the ammonia per ton is close to the theoretical consumption, and a clean production can be realized. The synthetic method for the primary fat amide and the ammonia recovery and cycle device thereof are suitable for oleamide, erucyl amide, stearic amide, behenamide, lauramide, palm acid amide, peanut acid amide and 12-hydroxy stearic amide.

Description

technical field [0001] The present invention relates to the synthetic method of oil fine chemicals, relate in particular to a kind of primary fatty acid amide (RCONH 2 ) synthesis method and ammonia gas recovery and recycling device. Background technique [0002] Primary fatty acid amide (RCONH 2 ) is a high-efficiency, excellent, non-toxic, safe, environmentally friendly and sustainable polymer functional additive, which has the functions of smoothness, lubrication, antistatic, mold release, anti-corrosion and anti-aging. In the plastic industry, it is used as a slip agent, antistatic agent and release agent for films, engineering plastics and polymer alloys; in the pharmaceutical industry, it is used as a reliever and lubricant for pharmaceutical preparations; in the coating and ink industry , used as additives for leveling, slipping, anti-adhesive and dispersing; also used as penetrating agent and gloss slip agent for paper and cardboard coating, metal rust inhibitor, fu...

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Problems solved by technology

② Urethane method: using fatty acid methyl ester and ammonia as raw materials, the reaction temperature is 170-185°C, the reaction time is 10-16h, and the yield is about 85%. However, because the product contains fatty acid methyl ester, it becomes soft and hairy Viscous, and contains trans isomers, the product purity is difficult to meet the requirements, and the synthetic waste gas (waste liquid) contains methanol, which is easy to cause environmental pollution

③Amination method: fatty acid and ammonia are used as raw materials, and the ammoniation reaction is carried out under the catalysis of a catalyst. This is the easiest route for the synthesis of primary fatty acid amides. Economical and effective catalysts with non-toxic requirements, accurate and corresponding process technical parameters, and ammonia recovery and recycling process devices, lack of practical and environmentally friendly complete process technologies

[0004] Traditional catalysts such as diatomite, molecular sieve, phosphoric acid, etc., have low catalytic activity. Catalysts such as alkyl tin, titanate, and metal hydrated oxides developed in recent years have relatively good activity, but poor adaptability to fatty acid raw materials and process conditions , some varieties will also affect the environmental protection and non-toxic safety of the product, and the price is expensive

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