Patent ID: 6013530
Filing Date: 2000-01-11
Classification: G01N,Y10T

Abstract:
A process to determine sulfur content of a sulfur containing sample comprising a method selected from the group consisting of(a) hydrocracking a sample with H.sub.2 in a hydrocracking ceramic reactor, introducing produced H.sub.2 S containing gas into a window-cell where a lead compound soaked tape is set, measuring darkness of said tape using a photo sensor, measuring value of differential output from a photo sensor circuit for determining sulfur content, and(b) burning a sample in a preburning ceramic reactor, hydrocracking the preburned sample with H.sub.2 in a hydrocracking ceramic reactor, introducing produced H.sub.2 S containing gas into a window-cell where a lead compound soaked tape is set, measuring darkness of said tape using a photo sensor, measuring value of differential output from a photo sensor circuit for determining sulfur content,the improvement comprising a procedure selected from the group consisting of(1) continuously introducing CO.sub.2 during stabilizing period and sample charging period into at least one of said reactor selected from the group consisting of said preburning ceramic reactor and said hydrocracking ceramic reactor, wherein CO.sub.2 /H.sub.2 volume ratio is 0.07 to 0.3,(2) using inverted AC current from stabilized DC current which has been converted from conventional AC supply and charged in a battery or a condenser as an electric supply for said photo sensor,(3) covering a box which contains said photo sensor and said measuring sensor circuit with heat insulating material,(4) A/D converting at 0.1 to 5 second interval said differential output from said photo sensor circuit, making moving averages using these 10 to 50 values, D/A converting and recording said moving averages, and determining sulfur content from height of said record, and(5) charging said differential output from said photo sensor circuit to a 100 to 300,00 .mu.F condensor through an 1 to 100 k.OMEGA. electric resistance, recording potential of said condenser, and determining sulfur content from height of said record.