Mitsubishi Jukogyo Kabushiki Kaisha

Setsuo Omoto

Atsushi Tatani

Susumu Okino

Masakazu Onizuka

Naoharu Shinoda

Takafumi Shimada

Hiroaki Ogasawara

Kazuto Kobayashi

Taku Shimizu

Yoshihiro Shiraishi

Takayoshi Hamada

Takayoshi Kawaoka

Takao Yamazaki

Hidetaro Mori

Kenichiro Nakamura

A stirring apparatus includes a container with a rotary stirring shaft therein. On the opposite sides of the rotary stirring shaft are mounted an upper vertical flat blade and first inclined flat blades opposite to each other. A first vertical flat blade has a sweptback blade associated therewith, and is mounted to the stirring shaft at a position under the first inclined flat blades, and a second inclined flat blade or blades and a second vertical flat blade having an associated sweptback blade are mounted to the stirring shaft at a position under the upper vertical flat blade. When the stirring shaft rotates, ascending flows of liquid to be processed along the inner wall within a vessel are generated by the upper vertical flat blade and the first and second vertical flat blades that are each associated with a sweptback blade. Descending flows of the liquid to be processed are generated by the inclined flat blades, thereby enhancing the mixing performance.

Stirring apparatus having blades creating a circulating flow

In order to improve mixing efficiency of highly viscous fluid, while structural simplicity being maintained, two types of stirring impellers are employed in a single stirring apparatus. One of such stirring impellers is a large flat impeller and the other is a slanted or screw-shaped impeller to cause an up-and-down flow. This principle is further utilized in a stirring tower type polymerization reaction apparatus which has an array of mixing areas, each of which corresponds to the stirring apparatus above, and partitions between the mixing areas. The partitions are disposed so that the temperature of reaction can be controlled easily. Undesirable effects such as 'dead space', space in which flow is insufficient, and the attachment of gelled material to the rotational shaft can be avoided while rather obvious, but no less important, advantages of efficient and uniform mixing, etc., are secured.

Stirring apparatus and stirring tower type apparatus for polmerization

A method for continuously measuring the concentration of CaCO.sub.3 and/or CaSO.sub.3 in slurries comprising CaCO.sub.3 and/or CaSO.sub.3 is described. The method comprises continuouly sampling a given amount of the slurry, feeding the slurry into an agitated continuous reactor container which is isolated from the outside air and in which the slurry is kept at a temperature not lower than 70.degree. C., adding sulfuric acid or hydrochloric acid to the slurry to make the pH below 3, blowing air or nitrogen gas into the slurry in the reactor container, withdrawing from the container CO.sub.2 and/or SO.sub.2 produced by reaction of CaCO.sub.3 and/or CaSO.sub.3 with the acid by entrainment with the air or nitrogen gas, and calculating the concentration of CaCO.sub.3 and/or CaSO.sub.3 from the concentration of CO.sub.2 and/or SO.sub.2 in the withdrawn gas, the flow rate of the sampled slurry and the flow rate of the blown air or nitrogen gas.

Method for measuring concentrations of CaCO.sub.3 and CaSO.sub.3 in a

In treating exhaust gases containing SO.sub.2, HCl and HF, there is disclosed a method of treating such exhaust gas which comprises detecting the amounts of HCl and HF in the exhaust gas and supplying an amount of a magnesium compound commensurate with a stoichiometric amount to become at least MgCl.sub.2 and MgF.sub.2 in an exhaust-gas treating tower and a calcium compound as a SO.sub.2 solvent into the exhaust-gas treating tower. The aforesaid method of treating an exhaust gas comprises a method of causing Mn ion to coexist in an absorbing solution in contact with the exhaust gas.

Method of treating exhaust gases

A method for controlling the concentration of a slurry in an absorption tower in which a flue gas comprising SO.sub.2 is brought into contact with a slurry containing suspended Ca compounds therein to absorb the SO.sub.2 with the compounds. The method comprises withdrawing the slurry from the absorption tower in such a way that the slurry is divided into at least two groups with different concentrations, one group being a slurry having a higher concentration of the Ca compound, the other group being a slurry having a lower concentration of the Ca compound, and regulating rates of the slurries being withdrawn from the absorption tower whereby the concentration of the Ca compound in the slurry being contacted with the flue gas is controlled.

Method for controlling a concentration of slurry in wet flue gas

A process for treating a waste gas containing SO.sub.2 and HCl which comprises determining the amount of HCl in said waste gas and supplying at least one magnesium salt selected from the group consisting of MgSO.sub.4, MgSO.sub.3, MgO, MgCO.sub.3 and Mg(HSO.sub.3).sub.2 in an amount corresponding to the amount of HCl additionally supplying CaCO.sub.3 or Ca(OH).sub.2 as an absorbent for SO.sub.2 to a column for treating said waste gas.

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Hiroshima, Japan

Setsuo Omoto