Process for producing biodiesel form seed of soapberry plant

Abstract

The invention belongs to the burning fuel technical field, particularly relating to a method for making biological diesel oil by seeds of Chinese soapberry. The making steps of the invention are as follows: the seeds of Chinese soapberry are separated, dried and crushed and put in a reaction kettle provided with a cutting and blending device and added with bridle chain alcohols and fatty acid methyl esters, and the mixture undergoes high speed cutting and stirring at the room temperature for 1 to 4 hours to form uniform suspension liquid, and the suspension liquid is added with alkalescent materials and undergoes the high speed stirring for 1 t0 4 hours; KOH or NaOH is dissolved in methyl alcohols to prepare the KOH or NaOH methanol solution with mass percentage concentration between 8 and 10 percent, which is used as catalyst; the suspension liquid is added with the catalyst and undergoes back flow reaction for 0.5 to 4 hours; after the reaction, reactants are cooled down to the temperature of 40 DEG C and then undergo pressure filtration to obtain separated filtrate, and filter cakes are used for other purposes; the separated filtrate undergoes standing separation to remove side products such as glycerin, etc. on the lower layer, and coarse products of the biological diesel oil are obtained; the coarse products of biological diesel oil undergo normal pressure distillation to recover excessive bridle chain alcohols and undergo molecular distillation to obtain the qualified biological diesel oil. The biological diesel oil made by the method has the advantages of high cetane number and low solidifying point, and is suitably used in the low temperature condition. The method of the invention has the advantages of simple production process, low cost and good economical efficiency of process, and has a good prospect for large-scale popularization and application.

Description

technical field [0001] The invention relates to the technical field of fuel combustion, in particular to a method for producing biodiesel from Sapindus seeds. Background technique [0002] Liquid fuel is one of the cornerstones of maintaining the normal operation of modern society and is the most important power fuel. With the development of the world economy, global fossil resources are becoming increasingly depleted, and the supply situation of liquid fuel is becoming increasingly severe. Energy shortage has become one of the important factors restricting the economic development of all countries in the world. my country imported 120 million tons of crude oil in 2004, accounting for 44% of the total processed crude oil. Excessively high import dependence has threatened the national energy strategy security. In terms of energy consumption structure, my country is a big diesel consumer. In 2003, it consumed 83.07 million tons of diesel and 40.16 million tons of gasoline. In...

AI Technical Summary

Problems solved by technology

There are two methods for extracting Sapindrome oil from the seeds of Sapindrome plants: one is the pressing method, because the chemical composition of Sapindrome oil is mainly fatty acid triglycerides of C18 and C20, and its viscosity is relatively large. There are more oils and fats remaining in the seed pod during pressing, so this preparation method has the main disadvantages of low extraction yield and high cost of Sapindus oil; The preparation method requires a large amount of solvent, which not only has poor production safety, but also causes waste and loss of the solvent, resulting in high extraction costs

[0010] At the same time, when using oil as a raw material to carry out transesterification to prepare biodiesel, the acid value of the oil is required to be <0.5 (the acid value of Sapindus oil is greater than 2), otherwise oil saponification will occur. In industry, oil acid catalyzed esterification is usually used first. The "two-step" production process of the reaction followed by the alkali-catalyzed transesterification reaction (that is, the acid-catalyzed esterification reaction of the oil is carried out first, and the acid value is removed through the esterification reaction, which can reduce the acid value of the oil to below 0.5, and then use Sodium methoxide is used as a catalyst for transesterification) to avoid oil saponification. This "two-step" production method has complex procedures, large equipment investment, large sewage discharge, and high environmental protection treatment costs.