How do I get old equipment for my university?

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I teach chemistry in the only university in northern Ghana, West Africa. Northern Ghana is the most deprived and poorest in Ghana. I think the higher institutions in developed countries of the world usually upgrade their equipment over a period of time. I seek to know if some of the institutions will agree to give my university any equipment that is functional but no longer in use. My major interest is laboratory equipment for teaching and learning of Chemistry. I know that there are some challenges to overcome. One is how to pay for the transportation of any equipment to Ghana. I just want to move one step at a time. I don't know if I make this request using the right medium but it's better to try than wish. This idea came to me and I want to give it a trial. Can you assist in any way or know institutions that may be of help? I'll be very glad to hear from you. Thanks.