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Rectifying column start-up method

A rectifying tower and wax fraction technology are applied in the field of rectifying towers for hydrocracking products, and can solve problems such as blockage of the second rectifying tower

Active Publication Date: 2013-01-02
JAPAN OIL GAS & METALS NAT CORP +5
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] When the above-mentioned hydrocracked product of the wax fraction is supplied to the second rectification tower 20 in this state, the temperature of the above-mentioned hydrocracked product decreases and becomes solid or semi-solid, and the second rectification tower 20 may be generated or connected thereto. Problems such as clogging of piping etc.

Method used

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Effect test

no. 1 approach

[0097] In the first embodiment, a hydrocarbon oil that is liquid at normal temperature and pressure and includes at least a part of the hydrocracked product of the wax fraction is used for preheating the second fractionator 20 at startup. Usually, the hydrocarbon oil is liquid at normal temperature and pressure, and therefore at least a part of the hydrocracked product needs to be liquid at normal temperature and pressure. The above-mentioned hydrocracked product may be produced and stored in the operation before the start-up operation, but it is preferable to start operation before the start-up of the second fractionator 20 and supply it from the wax fraction hydrocracking unit 50 in operation. Thereby, it is not necessary to install facilities for storing the hydrocracked product, and the facility cost can be reduced. Next, this first embodiment will be described in detail.

[0098] In the start-up of the second fractionator 20, first, the operation of the wax fraction hydr...

Embodiment 1

[0123] A mixture of USY zeolite with an average particle size of 0.82 μm (molar ratio of silica / alumina: 37), alumina-boria (mass ratio of alumina / boria: 5.6) and alumina base material (USY Zeolite / alumina-boria / alumina base material=4 / 56 / 40 (mass ratio)) was formed into a cylindrical shape with a diameter of about 1.5 mm and a length of about 3 mm by extrusion molding. The obtained molded body is dried and fired to obtain a carrier. The support was impregnated with an aqueous solution of chloroplatinic acid, and 0.6% by mass of platinum was supported as platinum atoms based on the mass of the support. By drying and firing this, a hydrocracking catalyst is obtained.

[0124] Next, the obtained hydrocracking catalyst is packed into a fixed-bed flow-through reactor, using figure 2 The apparatus shown in the figure hydrocracks a crude wax fraction (having 21 to 80 carbon atoms and 95% by mass of normal paraffins) obtained by fractional distillation of FT synthetic oil.

[012...

Embodiment 2

[0132] Set the reaction temperature of the wax fraction hydrocracking unit 50 to 320°C, and set the LHSV from 0.7h to -1 to 2.0h -1 Gradually rise, the valve (not shown) provided in the pipeline 53 is closed, the liquid component obtained from the first gas-liquid separation device 55 is recycled to the wax fraction hydrocracking device 50 through the pipeline 58 and the pipeline 24, and only the The liquid component obtained by the second gas-liquid separation device 57 is supplied to the second rectification column 20 through the lines 54, 51 and the heat exchanger 28, and the second rectification column 20 is carried out by the same operation as in Example 1 except that start. In addition, the hydrocarbon oil obtained from the second gas-liquid separator 57 was extracted through the line 51, and the pour point was measured, which was -17.5°C.

[0133] Furthermore, the start-up of the second fractionator 20 was completed without causing problems such as clogging due to sol...

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Abstract

Disclosed is a method for the start-up of a rectifying column to which a hydrocracking product produced by the hydrocracking of a wax fraction contained in a Fischer-Tropsch synthetic oil in a wax fraction hydrocracking process is to be supplied and in which the hydrocracking product is fractionated. The method comprises a preheating step of carrying out the preheating of the rectifying column using a hydrocarbon oil which contains at least a portion of the hydrocracking product and has a liquid form at ambient temperature and ambient pressure.

Description

technical field [0001] The present invention relates to a start-up method of a rectification column for supplying and fractionating a hydrocracked product of a wax fraction contained in a synthetic oil produced by a Fischer-Tropsch synthesis reaction. [0002] This application claims priority based on Japanese Patent Application No. 2010-70287 filed in Japan on March 25, 2010 and Japanese Patent Application No. 2010-76987 filed in Japan on March 30, 2010, and the contents thereof are incorporated herein. Background technique [0003] In recent years, from the viewpoint of reducing the environmental load, clean liquid fuels with low contents of sulfur components and aromatic hydrocarbons and which are gentle on the environment have been demanded. From this point of view, as a technology capable of producing fuel oil bases rich in aliphatic hydrocarbons, especially kerosene and light oil bases, which do not contain sulfur components and aromatic hydrocarbons, research has been...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G7/00
CPCC10G2300/4081C10G65/14C10G7/12C10G2300/1022C10G7/00C10G47/00C10G2300/4031B01D3/14B01D3/42
Inventor 田坂和彦
Owner JAPAN OIL GAS & METALS NAT CORP
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