Method for the preparation of pitch-in-water slurry
AssigneesChiyoda Chem. Engineering & Constr. Co., Nikka Chemical Industry Co., Ltd.
InventorsHiroto Tajima, Hironori Kawakami, Zenichi Mashino, Seinoshin Hayami, Osamu Ohzeki
Life of this patent
Estimating the term…
Abstract
Molten pitch, such as obtained in petroleum refining, is comminuted as such in the presence of water to obtain coarse pitch particles solidified during the comminution by contact with the water. The coarse pitch particles are further pulverized in the presence of water and, preferably, a dispersant to form a slurry containing the finely pulverized pitch particles dispersed in the water.
Claims17
A method of preparing a pitch-in-water slurry, comprising the steps of:
- mechanically molten pitch in the presence of water to obtain coarse pitch particles solidified during the comminution by contact with the water, and
- finely pulverizing the coarse pitch particles in the presence of water to form a slurry containing the finely pulverized pitch particles dispersed in the water.
A method of preparing a pitch-in-water slurry product, comprising the steps of:
- feeding molten pitch, water and a cooled, recycled pitch-in-water slurry to a pulverizing zone;
- pulverizing, in the pulverizing zone, the molten pitch to obtain pulverized pitch particles solidified during the pulverization by contact with the water and the cooled recycle slurry and to form a slurry containing the pulverized and solidified pitch particles dispersed in the water;
- withdrawing at least a part of said slurry from said pulverizing zone;
- dividing the withdrawn slurry into first and second portions;
- recovering said first portion as the pitch-in-water slurry product;
- cooling said second portion;
- and
- recycling said cooled second portion to said pulverizing zone as said cooled, recycled pitch-in-water slurry.
A method of preparing a pitch-in-water slurry product, comprising the steps of:
- providing two or more pulverizing zones each equipped with a mechanical pulverizer connected in series, including an upstream end pulverizing zone and a downstream end pulverizing zone;
- feeding molten pitch and water to the upstream-end pulverizing zone;
- feeding molten pitch and a cooled, recycled pitch-in-water slurry to each of the zone or zones other than the upstream-end pulverizing zone;
- pulverizing in each pulverizing zone the molten pitch to obtain pulverized pitch particles solidified during the pulverization by contact with the water or the cooled, recycled pitch-in-water slurry and to form a slurry containing the pulverized and solidified pitch particles dispersed in water;
- withdrawing a portion of the slurry from each zone;
- cooling the slurry withdrawn from each of the zone or zones other than the downstream-end pulverizing zone and introducing the cooled slurry to its adjacent downstream-side pulverizing zone as the cooled, recycled pitch-in-water slurry;
- and
- recovering the slurry withdrawn from the downstream-end pulverizing zone as the pitch-in-water slurry product.
Dependencies are inferred from the claim text.