Fischer-Tropsch synthesis oil hydrofining method

A Fischer-Tropsch synthetic oil and hydrofining technology, which is applied in the field of oil hydrogenation conversion, can solve problems such as difficulty in maintaining stable operation, coking of catalysts, and high heat, and achieve stable operation of the reaction, high conversion rate, and reduced reaction exothermic effect

Inactive Publication Date: 2019-07-19
BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defects in the prior art that the heat released by the hydrogenation reaction is too high and the temperature rise is large, which leads to coking and deactivation of the catalyst, and it is difficult to maintain stable operation, thereby providing a A Fischer-Tropsch synthetic oil hydrofinishing method that releases low heat, low reaction temperature, is not easy to coke and deactivate the catalyst, is easy to maintain stable operation, and can maintain a high conversion rate of olefins and oxygenates for a long time

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Examples

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Embodiment 1

[0028] This embodiment provides a method for hydrofinishing of Fischer-Tropsch synthetic oil, comprising:

[0029] S1, the Fischer-Tropsch synthetic oil is mixed with hydrogen after being metered by a metering pump, and a noble metal catalyst is used, wherein the noble metal is platinum Pt, the content of Pt is 5wt%, the carrier is alumina, and the specific surface area of ​​alumina is 350m 2 / g, the control reaction temperature is 120°C, the pressure is 2MPa, and the space velocity is 1.0h -1 , the volume ratio of hydrogen to oil is 300, low-temperature pre-hydrogenation reaction is carried out, and the unsaturated olefins in the Fischer-Tropsch synthetic oil are converted into corresponding saturated hydrocarbons to obtain pre-hydrogenation products;

[0030] S2. The pre-hydrogenation product obtained in S1 is subjected to a deep hydrodeoxygenation reaction, using a high-nickel catalyst, wherein the content of Ni is 45wt%, the carrier is alumina, and the specific surface are...

Embodiment 2

[0034] This embodiment provides a method for hydrofinishing of Fischer-Tropsch synthetic oil, comprising:

[0035] S1, the Fischer-Tropsch synthetic oil is mixed with hydrogen after being metered by a metering pump, and enters the first reactor, which is filled with a noble metal catalyst, wherein the noble metal is platinum Pt, wherein the content of Pt is 3wt%, and the carrier is alumina, The specific surface area of ​​alumina is 350m 2 / g, the control reaction temperature is 140°C, the pressure is 4MPa, and the space velocity is 2.0h -1 , the volume ratio of hydrogen to oil is 600, low-temperature pre-hydrogenation reaction is carried out, and the unsaturated olefins in the Fischer-Tropsch synthetic oil are converted into corresponding saturated hydrocarbons to obtain pre-hydrogenation products;

[0036] The pre-hydrogenation product obtained in steps S2 and S1 enters the second reactor, which is filled with a high-nickel catalyst, wherein the content of Ni is 30wt%, and t...

Embodiment 3

[0040] This example adopts a method similar to that of Example 2 to carry out the hydrofining of Fischer-Tropsch synthetic oil. The difference is that in step S1, the precious metal catalyst loaded in the first reactor has a Pt content of 0.5 wt%, and the low-temperature preheating The conditions of the hydrogenation reaction are: the reaction temperature is 160°C, the pressure is 6MPa, and the space velocity is 5.0h -1 , the volume ratio of hydrogen to oil is 1000; in the S2 step, the Ni content of the high-nickel catalyst packed in the second reactor is 43wt%, and the conditions of the deep hydrodeoxygenation reaction are as follows: speed is 2h -1 , the volume ratio of hydrogen to oil is 1000; the circulation ratio of hydrorefined products is 40%.

[0041] Using the same method as in Example 2 to measure the temperature rise in the prehydrogenation reaction and the hydrodeoxygenation reaction, the amount of carbon deposition, and the conversion rate of olefins and oxygenat...

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Abstract

The invention provides a Fischer-Tropsch synthesis oil hydrofining method which comprises the following steps: S1, mixing Fischer-Tropsch synthesis oil with hydrogen, carrying out a low-temperature pre-hydrogenation reaction, and converting unsaturated olefins in the Fischer-Tropsch synthesis oil into corresponding saturated hydrocarbons to obtain a pre-hydrogenation product; S2, performing a deephydrodeoxygenation reaction on the pre-hydrogenation product to obtain a hydrofining product; and S3, circulating a part of the hydrofining product, conducting mixing with Fischer-Tropsch synthesis oil, and then carrying out a low-temperature pre-hydrogenation reaction. Through circulation of a part of the hydrofining product, reaction temperature rise can be reduced, coking carbon deposition andinactivation of a catalyst are prevented, stable operation of the reaction is easy to maintain, and a high olefin conversion rate and a high oxygen-containing compound conversion rate are maintainedfor a long time.

Description

technical field [0001] The invention relates to the technical field of hydrogenation conversion of oil products, in particular to a method for hydrofinishing of Fischer-Tropsch synthetic oil. Background technique [0002] my country is a typical country with more coal and less oil, and the development of Fischer-Tropsch synthesis technology for producing liquid fuel from coal through synthesis gas is one of the important ways to solve the shortage of oil products. Fischer-Tropsch synthesis products are divided into two parts: oil and wax, which have the characteristics of no sulfur, no nitrogen and low aromatics. They are mainly organic hydrocarbons with a high content of olefins. At the same time, alcohols, acids, aldehydes, ketones and esters are by-products. Oxygen compounds have relatively strong acidity, and the acid value can reach up to about 30mgKOH / g. If not treated in the subsequent processing, it will not only easily corrode the equipment, but also affect the prop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G65/04B01J23/42B01J23/44B01J23/755
CPCB01J23/42B01J23/44B01J23/755C10G65/04C10G2300/1022C10G2300/201
Inventor 刘营胡胜高群仰
Owner BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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