Method for increasing UV transmittance of ethylene glycol

A method for improving the ultraviolet transmittance of ethylene glycol, the method comprising contacting an ethylene glycol solution and hydrogen with one of the following catalysts:

• (i) an unsupported metal alloy catalyst consisting of nickel, one or more rare earth element, tin and aluminum, the contents of the components in parts by weight being 10-90 parts, 1-5 parts, 1-60 parts and 5-9 parts respectively,
• (ii) an unsupported catalyst consisting of nickel, one or more rare earth element, tin, aluminum and tungsten, the contents of the components in parts by weight being 10-90 parts, 1-5 parts, 1-60 parts, 5-9 parts and 1-90 parts respectively;
• (iii) an unsupported catalyst consisting of nickel, one or more rare earth element, tin, aluminum, tungsten and molybdenum, the contents of the components in parts by weight being 10-90 parts, 1-5 parts, 1-60 parts, 5-9 parts, 1-90 parts and 0.5-20 parts respectively;
• or
• (iv) an unsupported catalyst consisting of nickel, one or more rare earth element, tin, aluminum, tungsten, molybdenum and boron or phosphorous, the contents of the components in parts by weight being 10-90 parts, 1-5 parts, 1-60 parts, 5-9 parts, 1-90 parts, 0.5-20 parts and 0.01-5 parts respectively.