阅读说明：本技术 一种食品级白油生产工艺 (Production process of food-grade white oil ) 是由 朱光亮 姚国福 王志保 杨栋 于 2020-05-14 设计创作，主要内容包括：本发明属于食品级白油生产领域,公开了一种食品级白油生产工艺,一种食品级白油生产工艺,包括以下步骤：一、以馏分油为原料在10～20MPa压力、体积空速为0.5-1.5h<Sup>-1</Sup>,温度为250～270℃的调节下,将所述原料油与氢气混合后引入加氢处理反应器；所述加氢精制条件为：反应温度为270～380℃、反应压力为8-12MPa、体积空速为1.2-1.6h<Sup>-1</Sup>；通过本方案以馏分油为原料,采用加氢精制、异构降凝、加氢补充精制工艺,脱除原料中的硫化物、氮化物、氧化物、有机酸、酚、烯烃及芳烃等杂质,生产出食品级白油,且原料来源稳定可控,生产工艺稳定,可从原料到产品整体把控质量,降低了设备的要求、能耗及生产成本,增加经济效益。(The invention belongs to the field of food-grade white oil production, and discloses a food-grade white oil production process, which comprises the following steps: firstly, distillate oil is used as a raw material, and the pressure and the volume space velocity of the distillate oil are 10-20 MPa and 0.5-1.5h ‑1 Under the regulation of the temperature of 250-270 ℃, the raw oil and hydrogen are mixed and then introduced into a hydrotreating reactor; the hydrofining conditions are as follows: the reaction temperature is 270-380 ℃, the reaction pressure is 8-12MPa, and the volume space velocity is 1.2-1.6h ‑1 (ii) a According to the scheme, distillate oil is used as a raw material, and the processes of hydrofining, heterogeneous pour point depressing and hydrofinishing are adopted to remove impurities such as sulfide, nitride, oxide, organic acid, phenol, olefin and aromatic hydrocarbon in the raw material, so that the food-grade white oil is produced, the source of the raw material is stable and controllable, the production process is stable, the quality of the whole product from the raw material can be controlled, the requirement on equipment, the energy consumption and the production cost are reduced, and the economic benefit is increased.)

1. A production process of food-grade white oil is characterized by comprising the following steps:

firstly, distillate oil is used as a raw material, and the pressure and volume airspeed of the distillate oil are 10-20 MPaIs 0.5-1.5h^-1Under the regulation of the temperature of 250-270 ℃, the raw oil and hydrogen are mixed and then introduced into a hydrotreating reactor, and under the action of a hydrotreating catalyst, impurity and aromatic saturation reactions such as hydrodesulfurization and denitrification are carried out to obtain a hydrotreating product; the hydrofining conditions are as follows: the reaction temperature is 270-380 ℃, the reaction pressure is 8-12MPa, and the volume space velocity is 1.2-1.6h^-1；

Secondly, introducing the hydrotreated product obtained in the first step into an isomeric pour point depressing reactor after steam stripping, and performing isomeric pour point depressing reaction through an isomeric pour point depressing catalyst under the conditions that the reaction pressure is 8-12MPa and the temperature is 340-380 ℃ to obtain an isomeric pour point depressing product;

thirdly, the isomeric pour point depression product obtained in the second step enters a supplementary refining reactor after being stripped, and the pressure is 8-12MPa, the temperature is 280-320 ℃, and the volume space velocity is 1.2-1.6h^-1Under the condition of (1), performing a complementary refining reaction by using a complementary refining catalyst to obtain a complementary refining reaction effluent;

and fourthly, respectively carrying out gas-liquid separation on the supplementary refining reaction effluent in a high-pressure separator and a buffer tank, collecting a liquid phase, distilling the liquid phase through a reduced pressure distillation tower, collecting and fractionating to obtain the food-grade white oil, wherein the inlet temperature of the reduced pressure distillation tower is 320-350 ℃, and the vacuum degree is more than 5-20 pa.

2. A process for producing food grade white oil according to claim 1, wherein: in the raw oil, the concentration of sulfur is less than 10 mug/g, and the concentration of nitrogen is less than 10 mug/g.

3. A process for producing food grade white oil according to claim 1, wherein: in the first step, the volume ratio of the hydrogen to the raw oil is 800: 1.

4. A process for producing food grade white oil according to claim 1, wherein: the isomerization pour point depression reactor comprises at least two layers of isomerization pour point depression catalyst beds.

5. A process for producing food grade white oil according to claim 1, wherein: the heterogeneous pour point depressing catalyst contains a twelve-membered ring molecular sieve and a ten-membered ring molecular sieve, and the mesoporous areas of the twelve-membered ring molecular sieve and the ten-membered ring molecular sieve are both 50m²/g～250m²The proportion of the mesoporous area to the specific surface area is 25-65%.

6. A process for producing food grade white oil according to claim 1, wherein: the hydrotreating catalyst is a vulcanized catalyst with a pore volume of 0.20-0.50 cm³A specific surface area of 150 to 230 m/g²/g。

7. A process for producing food grade white oil according to claim 1, wherein: the supplementary refining catalyst is a noble metal reduction type catalyst, the noble metal reduction type catalyst comprises 0.8-1.6% of noble metal by mass, and the carrier is amorphous silicon-aluminum.

8. A process for producing food grade white oil according to claim 1, wherein: the specific surface area of the supplementary refined catalyst is 150-400 m²A pore volume of 0.4 to 0.6 cm/g³/g。

Technical Field

The invention relates to the technical field of food-grade white oil production, in particular to a production process of food-grade white oil.

Background

The white oil is a deep refined colorless, tasteless and transparent oily liquid, has excellent chemical stability and light stability, and is widely used in industries such as cosmetics, foods, medicines, plastics, chemical fibers, machinery, light industry and the like. Therefore, the white oil must meet strict specification requirements, and the food-grade white oil is required to meet the standard requirements of colorless, tasteless, easy carbon and ultraviolet absorption spectrum detection and the like through a deep refining method.

In recent years, with the development of food industry, medicine industry, chemical fiber industry and light textile industry, the living standard of people is continuously improved, the quality requirement of people on white oil is higher and higher, the demand of food-grade white oil is rapidly increased, and the existing production of food-grade white oil has the problems of complex process flow, high production cost, influence on economic benefit and the like.

Disclosure of Invention

Technical problem to be solved

1. Technical problem to be solved

Aiming at the problems in the prior art, the invention aims to provide a food-grade white oil production process, which solves the problems of complex process flow, high production cost, influence on economic benefit and the like in the existing food-grade white oil production.

(II) technical scheme

In order to achieve the purpose, the invention provides the following technical scheme:

a production process of food-grade white oil comprises the following steps:

firstly, distillate oil is used as a raw material, and the pressure and the volume space velocity of the distillate oil are 10-20 MPa and 0.5-1.5h^-1Under the regulation of the temperature of 250-270 ℃, the raw oil and hydrogen are mixed and then introduced into a hydrotreating reactor, and under the action of a hydrotreating catalyst, impurity and aromatic saturation reactions such as hydrodesulfurization and denitrification are carried out to obtain a hydrotreating product; the hydrofining conditions are as follows: the reaction temperature is 270-380 ℃, the reaction pressure is 8-12MPa, and the volume space velocity is 1.2-1.6h^-1；

Secondly, introducing the hydrotreated product obtained in the first step into an isomeric pour point depressing reactor after steam stripping, and performing isomeric pour point depressing reaction through an isomeric pour point depressing catalyst under the conditions that the reaction pressure is 8-12MPa and the temperature is 340-380 ℃ to obtain an isomeric pour point depressing product;

thirdly, the isomeric pour point depression product obtained in the second step enters a supplementary refining reactor after being stripped, and the pressure is 8-12MPa, and the temperature is280-320 ℃ and a volume space velocity of 1.2-1.6h^-1Under the condition of (1), performing a complementary refining reaction by using a complementary refining catalyst to obtain a complementary refining reaction effluent;

and fourthly, respectively carrying out gas-liquid separation on the supplementary refining reaction effluent in a high-pressure separator and a buffer tank, collecting a liquid phase, distilling the liquid phase through a reduced pressure distillation tower, collecting and fractionating to obtain the food-grade white oil, wherein the inlet temperature of the reduced pressure distillation tower is 320-350 ℃, and the vacuum degree is more than 5-20 pa.

Preferably, the concentration of sulfur in the raw oil is less than 10 mug/g, and the concentration of nitrogen is less than 10 mug/g.

Preferably, the volume ratio of the hydrogen to the raw oil in the first step is 800: 1.

Preferably, the isomerization pour point depression reactor comprises at least two beds of isomerization pour point depression catalyst.

Preferably, the isomerization pour point depressing catalyst contains a twelve-membered ring molecular sieve and a ten-membered ring molecular sieve, and the mesoporous areas of the twelve-membered ring molecular sieve and the ten-membered ring molecular sieve are both 50m²/g～250m²The proportion of the mesoporous area to the specific surface area is 25-65%.

Preferably, the hydrotreating catalyst is a vulcanized catalyst with a pore volume of 0.20-0.50 cm³A specific surface area of 150 to 230 m/g²/g。

Preferably, the supplementary refining catalyst is a noble metal reduction catalyst, the noble metal reduction catalyst comprises 0.8-1.6% of noble metal by mass, and the carrier is amorphous silicon-aluminum.

Preferably, the specific surface area of the supplementary refined catalyst is 150-400 m²A pore volume of 0.4 to 0.6 cm/g³/g。

(III) advantageous effects

Compared with the prior art, the invention provides a production process of food-grade white oil, which has the following beneficial effects:

(1) the method takes distillate oil as a raw material, and adopts hydrofining, heterogeneous pour point depressing and hydrofinishing processes to remove impurities such as sulfide, nitride, oxide, organic acid, phenol, olefin, aromatic hydrocarbon and the like in the raw material to produce the food-grade white oil, the source of the raw material is stable and controllable, the production process is stable, the quality can be integrally controlled from the raw material to the product, the process is simple, the requirement on equipment, the energy consumption and the production cost are reduced, and the economic benefit is increased.

(2) According to the scheme, most of heteroatoms such as sulfur, nitrogen and oxygen are removed through a hydrofining process, aromatic hydrocarbons are saturated and subjected to ring opening, the viscosity of target white oil is adjusted, paraffin hydrocarbons are selectively isomerized into branched chain paraffin hydrocarbons through an isomerization pour point depressing process, the pour point of an oil product is reduced, the viscosity and the oxidation stability of the product are improved, and a hydrofining process is mainly used for further saturating a small amount of unsaturated hydrocarbons generated in a pour point depressing process and a small amount of aromatic hydrocarbons which are not completely saturated, so that the white oil raw material with various properties such as viscosity, pour point and flash point meeting requirements is obtained.

(3) The twelve-membered ring molecular sieve and the ten-membered ring molecular sieve are combined in the isomerization pour point depressing catalyst, so that the catalyst can obtain a remarkably good pour point depressing effect in an isomerization pour point depressing process, and the catalyst is high in white oil yield and high in viscosity index.

(4) The produced white oil meets the index requirements of food-grade white oil, the content of aromatic hydrocarbon is lower than 0.01% w/w, the content of sulfur is lower than 1ppm, the condensation point is lower than-30 ℃, and the condensation point is far lower than the national standard requirements.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.