Toyo Engineering Corporation

Nittetsu Mining Co., Ltd.

Sumitomo Corporation

Atsushi Moriya

Kohei Mitsuhashi

Masanobu Kawata

Takayuki Sakamoto

Yutaka Yamaguchi

Tadayoshi Tomita

Katsutoshi Kikuchi

Akemitsu Iida

Ryo Kawarabuki

Youichi Yamamoto

Keita Kamiyama

Norifumi Sakai

Hirohumi Tanaka

Toshihiro Ishida

The present invention provides a method for producing lithium carbonate, that can shorten the time required in the production of lithium carbonate and has excellent maintenance property and production efficiency without forming fixed matters that require complicated procedures to remove in a reaction apparatus.

Method for producing lithium carbonate

The present invention relates to a method for producing lithium carbonate, which is important as a raw material of a lithium ion battery and the like, from brine resources. More specifically, the invention relates to a method for producing lithium carbonate, in which carbon dioxide gas obtained by calcining limestone is introduced, in the presence of ammonia, into a concentrated brine, which is prepared from a lithium-containing brine as a raw material through an evaporative concentrating step, a desulfurizing step and an electrodialysis step, thereby depositing lithium carbonate crystals, and the crystals thus deposited are recovered through solid-liquid separation.

A process is disclosed for the thermal cracking of heavy oil containing nonvaporizable, high-molecular weight hydrocarbone in the presence of steam in one or more thermal cracking tubes or ducts, which process is characterized in that a fluid comprising steam and heavy oil is flowed through a thermal cracking tube such that thermal cracking is carried out under the following conditions:

Process for thermal cracking of heavy oil

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Chiba, Japan

Atsushi Moriya