As a Belgian citizen can I apply for a Saudi visa in Beijing?

Dear Sir,
I am currently traveling in Asia (Taiwan, Japan, China etc…, at this moment I am in Thailand for business) and need to travel to Saudi Arabia for business purposes. As my next trip will be to China I want to apply in China. A letter of invitation will be provided from a Saudi company, can I apply for a business type in Beijing? If it is possible to apply are there any additional documents, steps needed? Thanks
Best Regards
Tony