mold or out of mold laminated calculus mixing granulation of pvc polymer melts by means of the equipments of the present invention to fully expand pvc aggregates so as to obtain high performance and high added value pvc products production process for pvc via extended u201c loop route u201d method natural gas or shale gas and starting materials of bioethanol the extended loop route for polyvinyl chloride as described below in this example is designed to set open window in the intermediate step of the basic loop route to allow addition of intermediate starting materials from external in order to adapt to diversity of resource structures in various countries and regions as shown in fig6 the specific embodiment is illustrated as follows in the above basic loop route process procedure as shown in fig4 in case that acetylene prepared from the left route can be conveniently supplemented or replaced with natural gas or shale gas depending on actual resource conditions in different regions acetylene can be produced by means of commonly known techniques such as natural gas methane partial oxidation process and the right route can be complemented with supporting equipment for bioethanol from natural resource this example provides a basic loop route method production system for polyvinyl chloride and the corresponding production process thereof as shown in fig7 the specific embodiment is illustrated as follows 1 start an oxygen enriched calcium carbide furnace 13 was a shaft furnace into which a homogeneous mixture of limestone powder and carbon material powder under strict proportioning requirement obtained by a device for pulverizing and mixing solid raw materials 11 was fed through a device for conveying solid materials 12 the oxygen enriched calcium carbide.