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Extracting desulfurizing agent, preparation method thereof and desulfurizing refining method for biodiesel oil

The technology of a biodiesel and a refining method is applied in the field of deep processing of biomass energy liquid fuel, which can solve the problems of pollution, high energy consumption and high refining consumption, and achieve the effects of simple process, low energy consumption and low refining consumption.

Inactive Publication Date: 2018-11-16
HUNAN ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional desulfurization mainly adopts catalytic hydrogenation or selective adsorption desulfurization, which has high energy consumption, high refining consumption, and is easy to cause pollution

Method used

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  • Extracting desulfurizing agent, preparation method thereof and desulfurizing refining method for biodiesel oil

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preparation example Construction

[0042] Further, the present invention also provides a method for preparing the above-mentioned extractive desulfurizer, the method comprising the following steps:

[0043] (1) Preparation of precursor A: 1-methylimidazole and n-bromobutane or bromopropane are stirred and reacted according to the mass ratio of 30-50:40-60. Place until a white solid is precipitated, then recrystallize with auxiliary agent B, and dry by rotary evaporation to obtain white solid precursor A; the components of said auxiliary agent B include: 20-40 parts of acetonitrile, 20-40 parts of ethyl acetate and 20 ~30 parts of acetone;

[0044] (2) Under the condition of stirring, put the above precursor A and sodium tetrafluoroborate in an acetone solvent according to the mass ratio of 40~50:50~70 to react to obtain a yellow viscous liquid, and the obtained liquid is washed with auxiliary agent C, spin steaming to obtain a bright yellow clear product; the composition of the auxiliary agent C includes: 40-6...

preparation example 1

[0064] The extractive desulfurizer is prepared by the following steps:

[0065] The composition of precursor A includes: 45 parts of 1-methylimidazole, 55 parts of n-bromobutane or bromopropane.

[0066] The composition of auxiliary agent B includes: 40 parts of acetonitrile, 40 parts of ethyl acetate and 20 parts of acetone.

[0067] The composition of auxiliary agent C (stabilizer C) includes: 50 parts of dichloromethane, 50 parts of chloroform.

[0068] Precursor A, sodium tetrafluoroborate (1.2 times the molar mass of Precursor A) and acetone of 1 / 3 of the total mass of raw materials were used as a solvent for the reaction, and electromagnetic stirring was performed at 20°C for 15 hours to obtain a yellow viscous liquid. The resulting liquid was washed twice with 3 times the volume of auxiliary agent C. The yellow viscous liquid was rotary evaporated under vacuum at 80 °C for 60 min to obtain a bright yellow clear product.

Embodiment 1

[0069] Example 1 Biodiesel desulfurization and refining method-extraction desulfurization process

[0070] The biodiesel produced from gutter oil raw material has a sulfur content of 1.73mg / L.

[0071] In a reactor with an interlayer, the raw material biodiesel was preheated to 120° C., and there was no residual methanol and water after vacuum distillation for 2 hours. The raw material biodiesel is cooled to 50° C., and a liquid ionic inorganic salt with a mass fraction of 18% is added. Stir continuously at 800r / min for 100min, during which 0.5% mass fraction of hydrogen peroxide is added dropwise as a catalyst for the extraction reaction. After the reaction is completed, the biodiesel is separated after standing and stratified, and the lower liquid ionic inorganic salt is recovered. The extraction and desulfurization were repeated 3 times under the same conditions.

[0072] After testing, the sulfur content of refined biodiesel was 0.14mg / L.

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Abstract

The invention belongs to the field of deep-processing of biomass energy liquid fuels and discloses an extracting desulfurizing agent, a preparation method thereof and a desulfurizing refining method for biodiesel oil. The extracting desulfurizing agent is liquid state ionic inorganic salt and is synthesized by carrying out a reaction on a precursor A and sodium tetrafluoroborate in a mass ratio of(40-50):(50-70), wherein the precursor A is 1-butyl-3-methylimidazole bromide or 1-propyl-3-methylimidazole bromide. The desulfurizing refining method for biodiesel oil comprises the following steps:adding the extracting desulfurizing agent and an accelerant of the extracting reaction into the biodiesel oil; and leaving the biodiesel oil to stand and layer after the reaction to separate the biodiesel oil. The liquid state ionic organic salt can remove sulfur in the biodiesel oil effectively, and the two phases are extremely easily separated, so that an emulsion phenomenon can be avoided effectively. The sulfur content of the biodiesel oil is reduced by extraction by means of the liquid state ionic organic salt. The sulfur content in the biodiesel oil can be reduced by 90% or above. The extracting desulfurizing agent has the advantages of low energy consumption, low refining consumption and no pollution.

Description

technical field [0001] The invention belongs to the field of deep processing of biomass liquid fuel, and more specifically relates to an extraction desulfurization agent, a preparation method thereof and a desulfurization and refining method of biodiesel. Background technique [0002] Biomass energy is the core component of global renewable resources and one of the basic resources for human survival and development, second only to coal, oil and natural gas. With the rapid development of economic globalization, while enjoying the fruits of science and technology, human beings are also forced to bear the dual pressures of energy shortage and environmental degradation. In recent years, under the support of multiple technologies, policies, and markets, the Chinese government has attached great importance to the development and utilization of biomass resources, and has successively issued a series of strategic plans and guiding policies, which have put forward proposals for the d...

Claims

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Application Information

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IPC IPC(8): C10G21/20C10L1/02C11B3/00C11B3/12
CPCC10G21/20C10G2300/202C10L1/02C11B3/001C11B3/006C11B3/12Y02E50/10
Inventor 肖志红张爱华李昌珠李培旺李力
Owner HUNAN ACAD OF FORESTRY
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