Method for preparing biodiesel from tall oil

Abstract

The invention relates to a method for preparing biodiesel from tall oil in the presence of a heterogeneous catalyst under a reinforced condition, which comprises: adding the tall oil and the catalyst into methanol to form mixed solution; performing the etherification of the mixed solution under a reinforced condition to obtain a mixture of the biodiesel, a resin acid and a neutral material; separating the heterogeneous catalyst and a dehydrating agent by standing and filtering; and separating the biodiesel from the rest mixture by using vacuum separation equipment. In the invention, the heterogeneous catalyst may be strongly acidic cation exchange resin, ionic liquid, a zeolite molecular sieve or other solid acids, the drawbacks of liquid acids are overcome, and the method has the advantages of repeated use, light equipment corrosion, light environmental pollution and the like. Meanwhile, by combining special energy forms such as ultrasonic radiation, microwave radiation and high temperature and high pressure and by using the energy, local high temperature, high pressure and cavitation, which are produced by the energy forms, the contact between reactants and the contact between the heterogeneous catalyst and the reactants are increased, the yield of the etherification is improved and the reaction time is reduced.

Description

technical field [0001] The invention relates to a method for preparing biodiesel from tall oil, and more particularly relates to a method for preparing biodiesel by utilizing tall oil for heterogeneous catalysis under enhanced conditions. Background technique [0002] Biodiesel is a general term for a series of low-carbon alkyl esters of fatty acids prepared from vegetable oil and animal oil through esterification or transesterification. It can be used as an efficient, safe and environmentally friendly energy source. It is a petrochemical diesel oil. effective substitutes. How to fully and effectively use it has become a research hotspot at home and abroad. Tall oil, as the recovery of pine alkaline pulping black liquor, contains high practical value components such as fatty acids, abietic acids and sterols. It has a huge output worldwide and a relatively low price. It is a chemical raw material with great application potential and high cost performance. The use of tall ...

AI Technical Summary

Problems solved by technology

[0003] Sulfuric acid, hydrochloric acid and other acidic catalysts commonly used in biodiesel are used as homogeneous catalysts, which are difficult to separate from the product and need to be removed through subsequent treatments such as neutralization, washing, drying, and distillation. A large amount of industrial waste water will be produced to pollute the environment

At the same time, it is easy to corrode equipment, and unnecessary side reactions will be caused due to its strong oxidizing, dehydrating, and sulfonating properties during the reaction process.