Tonen Corporation

Exxon Research and Engineering Company

Mitsubishi Gas Chemical Company, Inc.

Kazuyuki Murakami

Takashi Hino

Tsutomu Naito

Kazuyoshi Namiyama

Hiroshi Toshima

Isao Nakajima

Eiki Tsushima

Noriaki Oomori

Jun Takayasu

Yutaka Hasegawa

Shoukichi Yamamoto

Masaru Miura

Kazushi Tsurutani

Takayuki Izumi

This invention provides a base fuel oil, having improved response to lubricity additives, for diesel fuel oil characterized by (1) sulfur content of 0.03 wt % or less, (2) nitrogen content of 35 wt. ppm or less, (3) density of 0.835 g/cm,or less and (4) solubility parameter of 7.00 to 8.10, and also provides a diesel fuel oil composition comprising the above base fuel oil incorporated with a lubricity additive.

Base fuel oil for diesel fuel oil and diesel fuel oil composition comprising the same

The present invention provides a diesel fuel oil composition comprising a base fuel which contains normal paraffin compounds having a carbon number of 20 or more at 4.0 wt % or less, has a specific carbon number distribution in the high-boiling normal paraffin compounds, contains sulfur at 0.05 wt % or less, and is incorporated with 0.01 to 0.1 wt % of an FI and 0.002 to 0.1 wt % of lubricity improver.

Diesel fuel oil composition

A gas oil according to the present invention comprises a gas oil fraction, and has a sulfur content not higher than 0.05 wt %, and either or both of (1) a content of bicyclic and higher aromatic hydrocarbons in a range of from 3.5 wt % to 15 wt %, bicyclic and higher aromatic hydrocarbons having at least one side-chain C.sub.3-11 alkyl group amounting to at least 80 wt % of said first-mentioned bicyclic and higher aromatic hydrocarbons, and (2) a content of nitrogen-containing heterocyclic compounds in a range of from 80 ppm to 500 ppm, nitrogen-containing heterocyclic compounds having at least one side-chain alkyl group accounting for at least 90 wt % of said first-mentioned nitrogen-containing heterocyclic compounds. The gas oil according to the present invention, as a diesel fuel, can impart anti-wearing properties by simply adjusting its components without the need for incorporation of an additive such as an anti-wearing agent. It does not cause wearing of a fuel injection pump, has excellent storage stability and can be furnished as an economical gas oil. It can also be furnished as a gas oil suited for use especially in cold districts.

Gas oil (law451)

A carbon fiber-reinforced carbon composite material is disclosed which includes a matrix of carbon and unidirectionally oriented carbon fibers dispersed in the matrix, wherein the content of the carbon fibers is at least 50% based on the volume of the composite material, wherein the volume of pores having a pore diameter of 10 .mu.m or more is not greater than 5% of the total pore volume of the composite material, and wherein at least 90% of the total pore volume is the volume of open pores. The composite material is obtained by impregnating carbon fibers with a dispersion having a viscosity of 5-50 cP at 25.degree. C. and containing carbonaceous powder with an average particle diameter of smaller than 0.5 .mu.m in an organic solvent solution of a thermosetting resin. After unidirectionally aligning the carbon fibers, the impregnated fibers are molded and cured and then calcined.

Carbon fiber-reinforced carbon composite material and process for the

An optically anisotropic pitch, which is suited for manufacturing particularly high compressive strength carbon fibers in a stable fashion, with satisfactory productivity and continuously, and also a method of manufacturing high compressive strength carbon fibers using the optically anisotropic pitch. The optically anisotropic pitch for manufacturing high compressive strength carbon fibers is composed of a benzene soluble component (BS) and a benzene insoluble component (BI) and has a Q value (i.e., weight-average molecular weight divided by number-average molecular weight) of 1.6 or below, a number-average molecular weight ratio of the benzene soluble component to the benzene insoluble component of 2.5 or below, an aromatic carbon fraction factor (fa) of 0.8 or below, a C/H atomic ratio of 1.85 or below and an optically anisotropic phase of 90% or more.

Optically anisotropic pitch for manufacturing high compressive strength

The pitch based carbon fiber has a uniform crystal structure in which substantially all crystal fibriles constituting the fiber have the thickness ranging from 30 to 200% of the average thickness Lav. Uniform stress distribution over uniform crystal fibriles can be obtained. This permits suppresion of non-linearity of the compressive modulus of elasticity of carbon fiber to greatly improve the compressive strength thereof. Typically, a compressive strength of 100 to 170 kg/mm.sup.2 can be obtained with a tensile modulus of elasticity of 50 ton/mm.sup.2. Such carbon fiber can be obtained by securing uniformity of molecular weight distribution of the liquid crystal pitch and also uniformity of the orientation of the liquid crystal constituent molecules by the application of multi-stage high shear spinning.

Growing community of inventors

Saitama-ken, Japan

Kazuyuki Murakami