A two-step method and apparatus for controlling cracking severity in the effluent from a cracking furnace such as an ethylene cracker. The method includes two steps. The first step consists of determining the near infrared spectrum of effluent in-line. The second step consists of changing the temperature...http://www.google.com.tw/patents/US6512156?utm_source=gb-gplus-share專利 US6512156 - Method and apparatus for controlling severity of cracking operations by near infrared analysis in the gas phase using fiber optics
