Toyo Engineering Corporation

Mitsui Toatsu Chemicals, Incorporated

Yuzuru Yanagisawa

Hidetsugu Fujii

Tetsuzo Honda

Hideaki Yanaru

Takashi Nagahama

Toyoyasu Saida

Hitoshi Nakamura

Kimikazu Kido

Koji Ishida

Tomomichi Tomita

Tokuo Oike

Takatatsu Shimokawa

Masakazu Sasaki

The process according to the invention comprises bringing gaseous hydrogen chloride in a non-condensable gas into contact with an absorbing medium selected from water or a dilute aqueous hydrogen chloride solution in an absorption column to cause the medium to absorb the gaseous hydrogen chloride, and subjecting the resultant absorbed solution to distillation in the presence of a salt having a salting-out effect to produce anhydrous hydrogen chloride.

Process for producing hydrogen chloride

In a reactor in which reaction tube(s), cooling tubes, heating tubes or combinations thereof are provided, a method for packing a catalyst comprising a step of packing the catalyst in the space formed between the inner wall of the reactor and the outer walls of the tubes by passing the catalyst through a flexible tube provided in the inside of the reactor and having a means to absorb the impact to the catalyst and thereby feeding the catalyst along the inner wall of the reactor with the falling distance of the catalyst maintained within a certain range and a step of fluidizing the catalyst thus-packed in said space, and a device for effecting the method.

Method for packing catalyst and device therefor

There is disclosed an improved, energy-saving granulation method, wherein use is made of a granulator (,) having a bottom floor (,) of a granulation section whose bottom is a perforated plate, an upper air feed pipe (,) for feeding air for fluidization to the bottom floor of the granulation section, a lower air feed pipe (,), air feed pipes (,) branched from the lower air feed pipe for jetting air into the granulation section, and jetting nozzles (,) provided at the centers of the air outlets for jetting a molten raw material; which involves the steps of jetting a molten raw material from the jetting nozzles to approximately spherical nuclei in the granulation section, which have been fed after the particle diameter has been caused to be an average particle diameter of 0.4 to 3.0 mm, to form granules. There is also disclosed an improved granulator.

Method for granulation and granulator

Disclosed is a process for concentrating aqueous urea solutions in which an aqueous urea solution is allowed to flow as a falling film in countercurrent contact with a stream of hot inert gas to concentrate it to 95-99% by weight and the aqueous urea solution so concentrated is then passed through a packed zone in cocurrent contact with a stream of hot inert gas to concentrate it to not less than 99.5% by weight.

Process for concentrating aqueous urea solutions

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Chiba, Japan

Yuzuru Yanagisawa