Innomdle Laboratory Co., Ltd.

Hanwha Total Petrochemical Co., Ltd.

Hyun Chul Choi

Byeong Yong Jeon

Tae Hyun Yoon

Jin Suk Lee

Ho Sik Chang

Yo Han Choi

Disclosed is a method for preparing methyl methacrylate (MMA), the method including: (1) separating isobutene containing saturated hydrocarbon (n-butane and iso-butane), via a catalytic distillation process from a stream of Chydrocarbons containing butadiene, n-butene, and isobutene; (2) producing methacrolein via a first oxidation reaction of the separated isobutene; (3) producing methacrylic acid via a second oxidation reaction of the produced methacrolein; and (4) esterifying the produced methacrylic acid with methanol. By having a high heat capacity, the amount of nitrogen added is minimized to reduce the size of the reactor and the amount of gas production at a rear end, which has a high economic feasibility due to the effect of reducing investment and investment cost.

MMA preparation method with isobutene including saturated hydrocarbon

A wearable device comprising: a band unit; and a vibration generating unit coupled to the band unit. The band unit comprises a communication unit receiving a first signal by a predetermined communication method and a control unit determining an amplification extent of the first signal received from the communication unit and generating a second signal based on the determined amplification extent, and the vibration generating unit receives the second signal from the control unit and generates a vibration corresponding to the second signal.

Wearable device, wearable device system and method for controlling wearable device

Growing community of inventors

Yongin-si, South Korea

Hyun Chul Choi