Process for producing biodiesel form seeds and fruits of plants

Abstract

The invention relates to a method for making biological diesel oil, in particular to a method for making biological diesel oil by seeds and fruit of plants. The making steps of the invention are as follows: the seeds and fruit of the plants are separated, dried and crushed and put in a reaction kettle provided with a cutting and blending device (the rotary speed is more than 300rev / m) 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 high speed stirring for 1 to 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 the 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 the standing separation to remove side products such as glycerin, etc. on the lower layer, and coarse products of 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 method of the invention has the advantages of simple production process, high utilization rate of vegetable fat, low manufacturing 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 a method for producing biodiesel, in particular to a method for producing biodiesel with plant seeds and fruits. Background technique [0002] Biodiesel is obtained from various animal and vegetable oils through esterification or transesterification, and its main component is long-chain fatty acid methyl ester. Biodiesel has high energy density, good lubricating performance, safe storage and transportation, good antiknock performance, full combustion and other excellent performance, renewability, environmental friendliness and good substitution performance, and is the bulk bio-based liquid with the most development potential fuel. The engine exhaust emission index using biodiesel not only meets the current Euro II standard, but even meets the more stringent Euro III emission standard that will be promulgated and implemented in Europe later. [0003] The raw materials for producing biodiesel are mainly animal oil and vegetable...

AI Technical Summary

Problems solved by technology

There are two main disadvantages of this preparation method: one is that the acid value of the vegetable oil squeezed first will increase during storage, so that when using it as a raw material to produce biodiesel with an alkaline method, the raw material oil must be pre-deacidified. The second is that because the chemical composition of vegetable oil is fatty acid triglyceride, its viscosity is relatively large, and there are more oils and fats remaining in the seed pool during pressing, which leads to a decline in the total extraction yield of biodiesel. higher cost