Medium temperature and low pressure process to prepare biological diesel oil

Abstract

The present invention is one medium temperature and low pressure process to prepare biological diesel oil with animal and plant oil and grease and waste oil and grease as main material. The preparation process includes the following steps: 1. mixing oil and grease 1000 weight portions, methanol 150-200 weight portions and catalyst 5-30 weight portions inside a reactor, and heating and pressurizing to 150-300 deg.c and 0.15-1.57 MPa to reaction for 4-6 hr; 2. lower to normal pressure, distilling to eliminate residual methanol, and stilling to separate out catalyst and glycerin water in the lower layer and to obtain crude biological diesel oil product; 3. washing with saturated table salt solution containing 10úÑ concentration Na2CO3 to obtain neutral crude biological diesel oil product; and 4. continuous vacuum distilling to collect 130-190 deg.c fraction as the biological diesel oil product at vacuum degree 5 mmHg. The present invention has the advantages of short reaction time, etc.

Description

technical field

[0001] The invention relates to a method for preparing biodiesel by a medium-temperature and low-pressure method, belonging to the field of oil and ester chemistry. Background technique

[0002] Biodiesel refers to the organic oil produced by transesterification from oil crops such as soybeans and rapeseeds, oil forest fruits such as oil palm and pistachio, engineering microalgae and other oil aquatic plants, animal fats and waste cooking oil, etc. Fatty acid ester fuel, which has the advantages of high cetane number, no sulfur and no aromatic compounds, can be biodegraded, non-toxic, harmless to the environment, and has a higher flash point than petrochemical diesel, which is more conducive to safe transportation and storage. In recent years, the global energy shortage has intensified, mineral energy has become increasingly scarce, and the development of alternative energy has become an inevitable trend. Biodiesel, an environmentally friendly clean and rene...