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    • 12. 发明授权
    • Method for separation of p-xylene
    • 对二甲苯分离方法
    • US06646177B2
    • 2003-11-11
    • US09929385
    • 2001-08-14
    • Tomonori TakahashiHitoshi SakaiNaoyuki Ogawa
    • Tomonori TakahashiHitoshi SakaiNaoyuki Ogawa
    • C07C7144
    • C07C7/144C07C15/08
    • A method for separating p-xylene by separating and recovering only p-xylene from a p-xylene-containing raw material mixture under high-temperature and high-pressure conditions using a zeolite membrane as a separating membrane is provided. The p-xylene partial pressure at the raw material side of the separating membrane is kept at a sufficiently high pressure and the p-xylene partial pressure at the recovery side of the separating membrane is controlled at a pressure which is not higher than the inflection point of p-xylene adsorption curve. This method for separating p-xylene using a zeolite membrane as a separating membrane can secure a sufficient p-xylene permeation amount and has industrial applicability.
    • 提供了一种通过使用沸石膜作为分离膜在高温和高压条件下从含对二甲苯的原料混合物中仅分离和回收对二甲苯来分离对二甲苯的方法。 将分离膜的原料侧的对二甲苯分压保持在足够高的压力下,将分离膜的回收侧的对二甲苯分压控制在不高于拐点的压力 的对二甲苯吸附曲线。 使用沸石膜作为分离膜分离对二甲苯的方法可以确保足够的对二甲苯渗透量并具有工业实用性。
    • 14. 发明授权
    • NOx sensor
    • NOx传感器
    • US5705129A
    • 1998-01-06
    • US626314
    • 1996-04-02
    • Tomonori TakahashiNaoyuki OgawaToshihiro YoshidaYuji Katsuda
    • Tomonori TakahashiNaoyuki OgawaToshihiro YoshidaYuji Katsuda
    • G01N27/12G01N33/00G01N27/04
    • G01N33/0037G01N27/12
    • An NOx sensor has the sensor element made of an oxide, the resistance of which is varied in response to an NOx component in a gas to be measured, and a measuring portion for measuring a resistance variation of the sensor element and for detecting an NOx concentration in the gas to be measured. A catalyst is arranged at an upstream side of a flow of the gas to be measured with respect reach to the sensor element, which makes a partial pressure ratio of NO/NO.sub.2 reach to an equilibrium state and removes a CO component from the gas to be measured. A heater for adjusting a temperature is arranged at a position close to the sensor element, which maintains temperatures of the sensor element and the catalyst constant. An O.sub.2 sensor is arranged at a position close to the sensor element so that the measuring portion can detect accurately the concentration of Nox in the measurement gas by reference to the resistance of the sensor element.
    • NOx传感器具有由氧化物制成的传感器元件,其电阻响应待测气体中的NOx成分而变化,测量部分用于测量传感器元件的电阻变化并用于检测NOx浓度 在要测量的气体中。 催化剂被布置在相对于传感器元件的被测量气体的流动的上游侧,这使得NO / NO 2的分压比达到平衡状态并从气体中除去CO成分 测量。 用于调节温度的加热器布置在接近传感器元件的位置,其保持传感器元件的温度和催化剂的恒定。 O2传感器布置在靠近传感器元件的位置,使得测量部分可以参考传感器元件的电阻精确地检测测量气体中的Nox的浓度。