Corrosion inhibitor for biodiesel production process by pyrolysis and application thereof

Abstract

The invention relates to a corrosion inhibitor for a biodiesel production process by pyrolysis. The corrosion inhibitor comprises the following components in parts by weight: 20-50 parts of naphthenic acid imidazoline amide, 2-20 parts of 2-methylpyridine, 2-15 parts of quaternary ammonium surfactant, 2-15 parts of benzotriazole, 10-30 parts of organic amine and 20-50 parts of solvent. The corrosion inhibitor disclosed by the invention is simple in component, convenient to prepare, strong in stability, small in dosage in the production process, and good in corrosion inhibition performance, and the high and low temperature corrosion problems of equipment such as a pyrolysis reaction kettle, a pipeline and the like can be solved.

Description

[0001] technical field [0002] The invention relates to a corrosion inhibitor for effectively inhibiting equipment corrosion in the process of high-temperature cracking of biomass oil to produce biodiesel, a preparation method and application thereof. Background technique [0003] Biodiesel includes all alternative fuels produced from biomass oil. Its raw materials come from a wide range of sources. Various waste cooking oils and waste oils, animal fats, and some plant oilseeds all contain more fatty acid esters. It can be used as a raw material for biodiesel. [0004] The existing method of producing biodiesel by oil cracking reaction generally uses cheap vegetable oil or animal oil as raw material, and uses transition metal catalyst, molecular sieve catalyst, activated alumina and sodium carbonate as catalyst to carry out one or more cracking, and the reaction conditions Generally, it is atmospheric pressure, 300-500°C. The conversion rate is between 50% and 90%. The ma...

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Problems solved by technology

In addition, it also includes various reaction processes such as alkylation reaction, alkane isomerization, alkane aromatic cyclomerization, olefin polymerization and decomposition, olefin hydrogenation and isomerization, etc. There are many types of intermediate products, resulting in complex product components.

During the reaction process, because the temperature is high and the raw materials and intermediate products contain a large amount of fatty acids, it is easy to corrode the equipment, especially the fire-facing surface of the heating furnace, due to the high temperature, the corrosion is more serious, and often after 2000 hours of use, it will appear. In the case of thin and corroded perforation, it may cause safety accidents

[0006] Due to the fact that oil thermal cracking devices are rarely industrialized, no one has studied the methods and additives for inhibiting equipment corrosion during the production process.

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