Profile: Shaanxi Research Design Institute of Petroleum and Chemical Industry specializes in providing 4,4-bis(diethoxyphosphonomethyl)-diphenyl, 4,4-bis(chloromethyl)-biphenyl, benzaldehyde-2-sodium sulphonate, ortho-anisaldehyde and super optical whitening agent. 4,4-Bis(diethoxyphosphonomethyl)-diphenyl is a white powder. It is used as a medium for prepare optical whitening agent. Ortho-anisaldehyde is a colorless rhombic crystalline. We are an ISO 9001 certified company.