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Toyo Engineering Corporation patents


Recent patent applications related to Toyo Engineering Corporation. Toyo Engineering Corporation is listed as an Agent/Assignee. Note: Toyo Engineering Corporation may have other listings under different names/spellings. We're not affiliated with Toyo Engineering Corporation, we're just tracking patents.

ARCHIVE: New 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 | Company Directory "T" | Toyo Engineering Corporation-related inventors


Urea production method

The present invention is a urea production method, including: a first concentration step of concentrating an aqueous urea solution; a granulation step of producing solid urea from the concentrated urea solution generated in the first concentration step; a urea recovery step of treating exhaust gas from the granulation step and recovering urea dust in the exhaust gas to generate a recovered aqueous urea solution, the granulation step being configured so as to treat a concentrated urea solution containing an additive; and a second concentration step of concentrating the recovered aqueous urea solution as an additional concentration step, wherein the concentrated recovered urea solution generated in the second concentration step is joined to the concentrated urea solution in the downstream of the first concentration step, and an additive is added downstream of the first concentration step. The present invention can produce a urea solution containing no additive for producing solid urea, while using the additive.. ... Toyo Engineering Corporation

Method and apparatus for treating urea aqueous solution

A method for treating a urea aqueous solution includes a first stripping step of steam stripping an aqueous solution containing urea, ammonia and carbon dioxide at 0.2 to 0.6 mpaa in a first stripper to separate ammonia and carbon dioxide from this aqueous solution into a gas phase; a hydrolysis step of hydrolyzing urea in the solution obtained from the first stripping step at an lhsv of 10 to 20 h−1, at 1.1 to 3.1 mpaa and 180 to 230° c. In a catalytic hydrolyzer; and a second stripping step of steam stripping a liquid obtained in the hydrolysis step in a second stripper to separate ammonia and carbon dioxide from this liquid into a gas phase. ... Toyo Engineering Corporation

Process for producing high-purity aqueous urea solution in urea production process

The present invention relates to a method for producing a high-purity aqueous urea solution, utilizing a urea production process at least including a urea synthesis step of synthesizing urea from a raw material feed to produce a urea synthesis liquid, and a urea purification step of purifying the urea synthesis liquid to produce an aqueous urea solution with high urea concentration. The present invention includes a urea crystallization step of separating a part of the urea synthesis liquid and/or a part of the aqueous urea solution and crystallizing urea contained in the separated urea synthesis liquid and/or aqueous urea solution to produce solid crystal urea, and a mixing step of mixing the crystal urea with water to produce a high-purity aqueous urea solution. ... Toyo Engineering Corporation

Method of adjusting duty of heat exchange in heat integrated distillation column

The duty of internal heat exchange can be flexibly adjusted without impairing energy saving performance of a hidic. A method of adjusting the duty of heat exchange in a heat exchange structure of a hidic includes totally condensing a portion of the vapor fed to a heat exchange structure in a heat exchange structure; and providing a liquid control valve downstream of the heat exchange structure on the first line, without providing a control valve on a vapor-flowing part of first and second lines of the hidic, and adjusting a flow rate of a portion of the compressor outlet vapor flowing into the heat exchange structure by using the control valve, while compensating for a pressure loss needed for the control valve by using a liquid head of a condensate, and/or by using pressurization by a pump.. ... Toyo Engineering Corporation

Solar heat collecting device

The present invention provides a solar heat collecting device having good heat collection efficiency. A uniaxial solar-tracking reflective mirror group is arranged such that each longitudinal axis thereof faces the same direction. ... Toyo Engineering Corporation

Method for producing lithium carbonate

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.. . ... Toyo Engineering Corporation








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