JPH0649463A - Production of modified kerosene - Google Patents

Abstract

PURPOSE:To produce a modified kerosene having improved smoke point with a simple process by adding a specific additive to a kerosene fraction which cannot be used as kerosene owing to its too low smoke point. CONSTITUTION:A modified kerosene having improved smoke point can be produced by a simple process comprising the compounding of a kerosene fraction with a 9-12C alicyclic compound produced from a starting raw material other than kerosene fraction.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method for improving the smoke point of kerosene cuts having a low smoke point.

[0002]

2. Description of the Related Art Problems to be Solved by the Prior Art and Invention
The kerosene specified by SK 2203 No. 1 is widely used for household lighting and warm kitchens. The above JIS K 2203 No. 1 generally uses a kerosene fraction obtained by distilling crude oil under atmospheric pressure as a NiMo-based catalyst or Co.
It is a product kerosene produced by hydrotreating using a Mo-based catalyst. There is a deep relationship between the flammability of product kerosene and the hydrocarbon composition. Generally, when the aromatic hydrocarbon content increases, the smoke point, which is a standard of flammability, specified in JIS K 2537 tends to decrease. It has been known. Further, in the conventional method for producing product kerosene, since the smoke point of product kerosene is determined by the type of crude oil, Southern crude oil, especially SE
The kerosene fraction obtained by treating RIA crude oil has a high aromatic hydrocarbon content and a low smoke point.
It cannot be used as a product kerosene because it does not meet the requirements specified in No. 1 of 2203. Therefore, the kerosene fraction obtained by treating southern crude oil is mainly used as a heavy oil component. However, in the current situation where there are many uses for light components, we would definitely like to use these fractions as kerosene.
In order to solve these problems, oil refineries are mainly conducting studies on improving the smoke point of kerosene. As a method for improving the smoke point, it has been proposed to partially recycle the kerosene fraction using a hydrotreating (refining) device to reduce the content of aromatic hydrocarbons (Japanese Patent Application No. 2-19409
2) In this method, the hydrogenation amount of the kerosene fraction decreases due to partial recirculation, and since the emphasis is placed on the hydrogenation treatment (nuclear hydrogenation) of the aromatic ring, the hydrogenation treatment is more severe than usual. Therefore, the manufacturing cost of the product kerosene increases, and the operation adjustment of the hydrotreating device is difficult to perform at the smoke point, so it is not a very effective method. On the other hand, it is conceivable to use aliphatic hydrocarbons positively as a method for improving the smoke point, but if the amount of aliphatic hydrocarbons increases excessively and the amount of aromatic hydrocarbons decreases significantly, practical performance as product kerosene This is not an effective method because the true heating value of the product kerosene specifically decreases.

[0003]

[Objective] Therefore, an object of the present invention is to improve the smoke point in a simple process by blending a kerosene fraction, which has a too low smoke point and cannot be used as kerosene, with a specific additive.

[0004]

The present invention relates to a kerosene fraction,
It relates to a method for producing a modified kerosene, which is characterized by improving the smoke point of a kerosene fraction by newly adding an alicyclic compound having 9 to 12 carbon atoms. The blending ratio of the kerosene fraction and the alicyclic compound is preferably 85 to 99% by volume of the kerosene fraction and 15 to 1% by volume of the alicyclic compound. Since the present invention aims to increase the amount of kerosene supplied, the alicyclic compound which is the additive of the present invention is also obtained by using a fraction other than kerosene as a starting material.

The contents of the present invention will be described in more detail below. The kerosene fraction used as the main base material in the present invention is, for example,
It is a kerosene fraction produced by hydrotreating the kerosene fraction distilled from the atmospheric distillation unit when treating crude oil with a high mixing ratio of southern crude oil, especially SERIA crude oil, and its properties are JIS K It is a kerosene fraction that does not pass only the smoke point in the 2203 No. 1 standard. JISK 220
No. 1 of 3 is as shown in the following table.

[Table 1] The alicyclic compound having 9 to 12 carbon atoms used in the present invention is an alicyclic compound having 9 to 12 carbon atoms in a carbon-saturated 6-membered ring, for example, the carbon number in reformed gasoline and catalytically cracked gasoline. Obtained by subjecting a part of the aromatic fraction of 9 to 12 to hydrogenation in a hydrogen stream at high temperature and high pressure with a catalyst (for example, a nickel-based catalyst, an alumina carrier carrying platinum or rhodium, etc.) and various hydrogenations. The smoke point is 30 mm or more, preferably 33 mm or more, more preferably 35 mm or more, and the boiling point range is 140 ° C to 250 ° C, preferably 145
℃ ~ 250 ℃, flash point is 26 ℃ or more, preferably 28 ℃
The above fractions. Specific components of these alicyclic compounds include trimethylcyclohexane, ethylmethylcyclohexane, propylcyclohexane, and tetramethylcyclohexane as main components, and diethylcyclohexane,
Methylpropylcyclohexane, butylcyclohexane, diethylmethylcyclohexane, pentylcyclohexane, triethylcyclohexane, tert-butyldimethylcyclohexane and the like, which is composed of a naphthene having 9 to 12 carbon atoms and having a cyclohexane ring as a base, and its purity is 99. The content is 0.0% by mass or more, preferably 99.9% by mass or more, and the aromatic content is 1.0% by volume or less, preferably 0.1% by volume or less.

[0006]

EXAMPLES The contents of the present invention will be described below in more detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto. In Examples 1 to 5 and Comparative Example 1, the method for sampling the kerosene fraction, the alicyclic compound having 9 to 12 carbon atoms and the reformed kerosene fuel is JIS K 2251, the reaction is JIS K 2252, and the flash point is JIS K 226.
5, distillation property is JIS K 2254, sulfur content is JIS
K 2541, smoke point is JIS K 2537, copper plate corrosion is JIS K 2513, color is JIS K 258
0, the density was measured by the method described in JIS K 2249. For composition analysis, FIA is JIS
The method described in K2536 was performed, and the aroma type analysis was performed using the visible-ultraviolet light absorption spectrum method (absorptiometric analysis) described in Japanese Patent Application No. 4-144925 filed by the present applicant. Regarding the amount of heat generation, JIS K
2279. A kerosene fraction produced by hydrotreating a kerosene fraction distilled from an atmospheric distillation unit when a crude oil having a mixture ratio of Southern crude oil, especially SERIA crude oil, of 30 to 40% is treated. Is JIS
A kerosene fraction (smoke point is 21 mm) that did not pass the smoke point standard 23 mm of K 2203 No. 1 was used as the reference (a), and this property is shown in Table 3 as Comparative Example 1. On the other hand, carbon number 9 to 1 having a smoke point of 33 mm or more added to the kerosene fraction
The alicyclic compound (b) of 2 used the thing obtained as follows. That is, an aromatic compound having a carbon number of 9 to 12 distilled from a catalytic reforming device or a catalytic cracking device is hydrotreated in a hydrogen stream at high temperature and high pressure using a catalyst (for example, a nickel catalyst). The obtained alicyclic compound having 9 to 12 carbon atoms (trimethylcyclohexane, tetramethylcyclohexane, etc.) was used. The kerosene fraction (a) and the alicyclic compound (b) were blended at the ratios shown in Tables 2-3. The results are shown in Tables 2-3. (Below margin)

[0007]

[Table 2]

[Table 3]

[0008]

[Effect] The present invention is a middle distillate (gasoline, kerosene, light oil).
From the historical background of increasing production of, it is possible to positively meet the demands of today's era when you want to send as much kerosene fraction as possible to kerosene products when processing southern crude oil,
A simple method (blending method) that can be used as kerosene by lowering the smoke point of a kerosene fraction that has failed JIS standard only for the smoke point, which was conventionally used only as a blending component of heavy oil, is provided. The social significance of the present invention in which the amount of kerosene supplied is increased is great. Further, normally, when the aromatic content is low, the smoke point is improved but the true calorific value is decreased, but according to the present invention, the excellent effect that the true calorific value is not decreased even if the smoke point is improved. Indicates.

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[Procedure amendment]

[Submission date] August 4, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

[0008]

[Effect] The present invention is a middle distillate (gasoline, kerosene, light oil).
From the historical background of increasing production of, it is possible to positively meet the demands of today's era when you want to send as much kerosene fraction as possible to kerosene products when processing southern crude oil,
A simple method (blending method) that can be used as kerosene by raising the smoke point of the kerosene fraction that has not been compliant with JIS standard only for the smoke point, which was conventionally used only as a blending component of heavy oil, is provided. The social significance of the present invention in which the amount of kerosene supplied is increased is great. Further, normally, when the aromatic content is low, the smoke point is improved but the true calorific value is decreased, but according to the present invention, the excellent effect that the true calorific value is not decreased even if the smoke point is improved. Indicates.

Front page continuation (72) Yuko Kosaka, 1 Shiohama-cho, Yokkaichi-shi, Mie Showa Yokkaichi Oil Co., Ltd. Yokkaichi Refinery (72) Inventor Takeo Nishida, 1 Shiohama-cho, Yokkaichi-shi, Mie Showa Yokkaichi Oil Co., Ltd. Yokkaichi Oil Refinery (72) Inventor Kuniaki Kozaki 3-5 Kasumigaseki, Chiyoda-ku, Tokyo Sho Awa Shell Oil Co., Ltd.

Claims (2)

[Claims] 1. A method for producing a modified kerosene, which comprises improving the smoke point of a kerosene fraction by blending a kerosene fraction with an alicyclic compound having 9 to 12 carbon atoms. 2. An aromatic compound having 9 to 12 carbon atoms derived from a catalytic reforming method or a catalytic cracking method, in which the alicyclic compound having 9 to 12 carbon atoms is a petroleum fraction other than kerosene fraction as a starting material. The method for producing a modified kerosene according to claim 1, which is obtained by nuclear hydrogenation.