A method for continuous production of biodiesel

A biodiesel and vegetable oil technology, which is applied in the preparation of biological raw materials, biofuels, and liquid hydrocarbon mixtures, can solve the problems of difficult recycling, long time required, high reaction temperature, etc., so as to reduce operating costs and equipment. Investment, avoiding the use of quenching equipment, the effect of flexible process

Active Publication Date: 2011-11-30
CHINA PETROLEUM & CHEM CORP +1
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chemical method mainly adopts acid and alkali as catalyzer, and when using alkali (organic or inorganic base) as catalyzer, there is a high conversion rate of triglyceride, but it is difficult to separate spent lye from the reaction product; when using acid as catalyzer, Requires high reaction temperature, high energy consumption and low yield
The reaction speed of the biological enzyme method is slow, and it takes a long time to reach the reaction equilibrium. At the same time, the lipase as a catalyst is obviously inactivated, and it is difficult to recycle, resulting in increased production costs.
And no matter which kind of catalyzer is adopted, the above-mentioned method all has following shortcoming: the content of the target product methyl ester in the ester phase that reaction obtains is generally 50%~90%, does not reach product standard requirement (requiring more than 96.5% usually), must pass Separation such as distillation and other means to concentrate the target product methyl ester, which leads to high energy consumption and low production efficiency
Although this method partially solves the cracking problem of unsaturated fatty acid chains by reducing the residence time of alcohol and oil at high temperature, it still has the situation that the reaction temperature is 280~350 ℃ high and the reaction pressure is 16~50MPa high; its embodiment also shows that if In order to obtain qualified biodiesel products (fatty acid methyl ester content greater than 96.5%), the total residence time of alcohol and oil in the device must be higher than 50 minutes

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The tubular reactor is heated to 200°C, the temperature of the impingement flow reactor is controlled at 310°C, the pressure is 18MPa, the molar ratio of methanol to cottonseed oil is 40:1, and the volumetric flow rate of cottonseed oil and methanol is used as the impingement flow reactor 6 times the volume (that is, the material residence time is 10 minutes) enters the impingement flow reactor, so that the oil and methanol are fully dispersed and reacted, then enter the tubular reactor, and the residence time in the tubular reactor is 10 minutes. With the further reaction and flow of the reaction material in the tubular reactor, the reaction material forms a temperature gradient gradually decreasing from 310°C to 200°C between the inlet and outlet of the tubular reactor, and the mixture coming out of the tubular reactor The material is flash evaporated to remove most of the remaining methanol, then cooled and left to stand for separation to obtain the fatty acid ester p...

Embodiment 2

[0033] The tubular reactor is heated to 320°C, the temperature of the impingement flow reactor is controlled at 320°C, the pressure is 20MPa, the molar ratio of methanol to cottonseed oil is 30:1, and the volume flow rate of cottonseed oil and methanol is the impingement flow reactor 4 times of the volume (that is, the material residence time is 15 minutes) enters the impingement flow reactor, grease and methanol are fully dispersed and reacted, then enter the tubular reactor, and the residence time in the tubular reactor is 30 minutes. The mixed material coming out of the tubular reactor was flash evaporated to remove most of the remaining methanol, then cooled down and left to separate to obtain the fatty acid ester phase (upper layer), which was analyzed by Agilent's 6890N gas chromatograph to measure the fatty acid triglyceride The conversion rate was 100%, and the content of methyl ester in the fatty acid ester phase was 94.1%.

Embodiment 3

[0035] The tubular reactor is heated to 160°C, the temperature of the impingement flow reactor is controlled at 350°C, the pressure is 25MPa, the molar ratio of methanol to cottonseed oil is 50:1, and the volumetric flow rate of cottonseed oil and methanol is used as the impingement flow reactor 8 times the volume (that is, the residence time of the material is 7.5 minutes) enters the impingement flow reactor to fully disperse the grease and methanol. After the reaction, it enters the tubular reactor, and the residence time in the tubular reactor is 15 minutes. With the further reaction and flow of the reaction material in the tubular reactor, the reaction material forms a temperature gradient gradually decreasing from 350°C to 160°C between the inlet and outlet of the tubular reactor, and the mixture coming out of the tubular reactor The material is flash evaporated to remove most of the remaining methanol, then cooled and left to stand for separation to obtain the fatty acid ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a method of producing bio-diesel continuously; animal, vegetable oil and low alcohol raw materials are reacted in a reactor composed of two parts and transformed into fatty acids short chain ester; namely, the bio-diesel; the first part of the reactor is a full-backmixing reactor used for providing high-efficiency mass transfer space for the raw materials so that the oils and the alcohols are enabled to be contacted sufficiently for reaction; the phase separation tendency of the mixture after reaction is reduced obviously; the second part of the reactor is a tubular reactor used for providing sufficient reaction time and space so that the raw materials are enabled to be transformed sufficiently for the generation of target product. Because reaction product from the reactor only contains very small quantity of residual glyceride, the product can fulfill the content requirement of the low carbon ester (such as methyl ester) in the product standards after the excessive lower alcohol and glycerol are separated from the product; thereby, the process of methyl ester distillation can be avoided.

Description

technical field [0001] The invention relates to the technical field of renewable energy, in particular to a method for continuously producing biodiesel with animal and vegetable oils as raw materials. Background technique [0002] Biodiesel is a renewable fuel obtained from renewable biomass resources that is similar in properties to diesel. Its main components are long-chain saturated / or Esters of unsaturated fatty acids and alcohols such as methanol or ethanol. [0003] Since biodiesel is derived from renewable biomass resources, it does not contain sulfur, aromatic hydrocarbons and other substances commonly found in mineral diesel oil, and will not produce SO after combustion X , less particulate matter, can effectively reduce the pollution of automobile exhaust to the environment, the use of biodiesel can effectively reduce the concentration of CO, TPM, etc. in the exhaust, and the contribution to the greenhouse effect is only 25% or lower than that of mineral diesel, s...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & AuthorityPatents(China)
IPC IPC(8): C10G3/00
CPCY02E50/13Y02E50/10Y02P30/20
Inventor陈明黎元生霍稳周吕清林李花伊高飞
OwnerCHINA PETROLEUM & CHEM CORP