{"id":3146,"date":"2019-06-27T00:32:18","date_gmt":"2019-06-27T00:32:18","guid":{"rendered":"https:\/\/weedmaps.com\/learn\/dictionary\/closed-loop-system"},"modified":"2026-03-05T15:55:52","modified_gmt":"2026-03-05T15:55:52","slug":"closed-loop-system","status":"publish","type":"dictionary","link":"https:\/\/weedmaps.com\/learn\/dictionary\/closed-loop-system","title":{"rendered":"Closed-loop system"},"content":{"rendered":"\n<p><span style=\"font-weight: 400;\">A closed-loop system is a term used to describe the equipment that allows processors to extract the active compounds from the cannabis plant using a variety of solvents in a safe, efficient environment. It is referred to as closed-loop because the solvent being used to extract the compounds from the plant matter does not come into contact with the external environment at any point during the extraction process. Also, the solvent makes a full loop on its phase change from liquid to gas and back to liquid again \u2014 the solvent starting and finishing in the same space.<\/span><\/p>\n\n\n\n<h2 class=\"wm-article-table-of-contents-header\" id=\"how-does-a-closed-loop-system-work\">\n\tHow does a closed-loop system work?<\/h2>\n\n\n\n<p><span style=\"font-weight: 400;\">Closed-loop systems vary mechanically, depending on the solvent that will be used. However, the general method remains the same. There are three main containment areas: a vessel that contains the primary solvent, one for the cannabis plant material, and one that is used to collect the resulting extract.&nbsp;<\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;\">Depending on the type of solvent being used, e.g. butane or carbon dioxide (CO2), the solvent may need to pass through the cannabis plant matter multiple times in order to strip off all the precious compounds, such as the cannabinoids and terpenes. For instance, butane is one of the most effective solvents and is capable of extracting almost all of the essential properties in one loop through the system. On the other hand, CO2 is a much more selective solvent and will take several more runs, and several more hours, to fully capture all the intoxicating and therapeutic properties of the cannabis plant.<\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;\">The process begins with a tank of liquid solvent or a gas that is mechanically converted into a liquid solvent. The next step is to allow the liquid solvent to flow into the tank with the cannabis buds or trim. At this point, the solvent will dissolve the active compounds in the plant and create a solution. The final tank is where the resulting extract goes and where the initial solvent used is evaporated from the solution through the use of heat. When the solvent evaporates into a gas, it rises and is condensed back into the first tank. The solvent can then be reused, either on the same cannabis or for a fresh batch.<\/span><\/p>\n\n\n\n<h2 class=\"wm-article-table-of-contents-header\" id=\"what-are-the-risks\">\n\tWhat are the risks?<\/h2>\n\n\n\n<p><span style=\"font-weight: 400;\">Each solvent has its own hazards and precautions are taken according to the solvent being used. Some solvents are flammable, while some are asphyxiants. Some operate at low pressure, others operate at high pressures. Each solvent is different and requires different engineering controls to ensure that all hazards are mitigated during the extraction process.<\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;\">Though it gained a bad reputation in the media for explosions that happened during \u201copen blasting\u201d \u2014 where the solvent is exposed to air during the extraction process \u2014 butane has a \u201cGenerally Regarded As Safe\u201d GRAS rating by the FDA, meaning it is Its flammability, however, makes using a closed-loop system the only available method of butane extraction, as open blasting has proven to be a dangerous alternative.&nbsp;<\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;\">CO2, while not flammable, is an asphyxiant that requires an extremely high amount of pressure to convert it from a gas into a supercritical fluid form that is capable of extracting the compounds from cannabis. The engineering controls used in these systems monitor the relative CO2 concentration in the air in order to ensure that workers are safe throughout the entire process. Safety measures are taken no matter the solvent, with sensors in place to detect even trace amounts of gas.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A closed-loop system is a term used to describe the equipment that allows processors to extract the active compounds from the cannabis plant using a variety of solvents in a safe, efficient environment. It is referred to as closed-loop because the solvent being used to...<\/p>\n","protected":false},"author":23,"featured_media":2319,"template":"","collections":[190],"class_list":["post-3146","dictionary","type-dictionary","status-publish","has-post-thumbnail","hentry","collections-concentrates"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v18.9 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>What Is A Closed Loop System? Closed Loop System Definition | Weedmaps<\/title>\n<meta name=\"description\" content=\"Learn more about closed-loop systems and how they are used in cannabis extraction. 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