Working SOP available for the conversion of mitragynine extract to 7-hydroxymitragynine with detailed list of all equipment needed for desired scale.
General scope: This is the conversion method using oxone but with the reaction conditions optimized for much higher throughput than what you would get by scaling the methods in published paper or patents (fyi, some of the patented methods don’t actually work). Also, the workup is much different than existing publications. Molecular yield of the oxone method is about 50%. If you wanted to produce about 20kg/mo you would need to buy about $100k of lab equipment (new equipment price) but if you have a cannabis or hemp lab sitting around collecting dust, you might already have most of the equipment already (ie, reactors, rotovaps etc). Contact me for consulting details to determine what is a best fit for your needs. The consult pays for itself in one day of work. Also available are HPLC methods for kratom alkaloids. Get in soon while 7-OH prices are still good 
I will try to be of service here where I can be though… The more competition, the better for the quality of this stuff out here.