In addition to obtaining nine international patents in eight countries, the technique of this production further was rewarded with the First National Invention Award of the Republic of China in 1992. There are two grades for this product: TSD-980 and TSD-990 with the purities of 98% and 99% respectively. Which are produced by highly selective disproportionation reaction of ethyl benzene. This product has been adopted by factories producing para-xylence both domestically and abroad. Numbers of customers has exceeded ten presently.