US 2026/0275070 A1Published application

Method for determining input amount of sodium hydroxide

AssigneeHonda Motor Co., Ltd.

InventorsKeishi ASADA, Ryo NAKAI

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Abstract

A method for determining an input amount of sodium hydroxide is provided, which can determine an appropriate input amount of sodium hydroxide when depolymerizing plastic composed of multiple types of resins. The method contributes to a significant reduction in generating waste. The appropriate input amount is determined by using a map including a graph having a plurality of lines. In the map, a horizontal axis represents a remaining amount of sodium hydroxide, and a vertical axis represents a deficient amount of sodium hydroxide. The method includes steps of calculating an amount of ethylene glycol or an amount of butanediol and a remaining amount of sodium hydroxide after a predetermined time has elapsed from when a predetermined amount of sodium hydroxide is added to a predetermined amount of the plastic, and applying these calculated amounts to the map.

Claims6

Dependent claims

A method for determining an input amount of sodium hydroxide required for depolymerizing plastic composed of multiple types of resins by using a map having a graph of a plurality of lines, wherein

a horizontal axis represents a remaining amount of sodium hydroxide and a vertical axis represents a deficient amount of sodium hydroxide in the map, and
the lines are shifted by an amount of ethylene glycol or an amount of butanediol in the graph,
the method comprising:
a step of calculating an amount of ethylene glycol or an amount of butanediol in filtrate of slurry after a predetermined time has elapsed, wherein the slurry is produced by adding a predetermined amount of sodium hydroxide to a predetermined amount of the plastic,
a step of calculating a remaining amount of sodium hydroxide in filtrate of the slurry, and
a step of calculating a deficient amount of sodium hydroxide by applying a value of the calculated amount of ethylene glycol or the calculated amount of butanediol and a value of the calculated remaining amount of sodium hydroxide, to the map.

3 more elements

Dependencies are inferred from the claim text.