Recycling Solves the Problem of Expensive Solvent Maintenance

If your manufacturing process includes the use of solvent to degrease your customer’s parts, you are likely aware that proper disposal of hazardous waste generated by a degreasing unit is costly and maintaining an efficient degreasing process requires clean solvent. What you may not know is that in-house solvent recycling provides cost savings while improving solvent quality. With today’s supply chain challenges and price increases, making every drop of solvent count is more important than ever.

As parts are cleaned in a typical degreaser, the contaminants removed by the solvent begin to increase in volume over time. To maintain the solvent purity level within acceptable ranges that do not affect cleaning capabilities, it is necessary to remove the contaminants from the degreaser on a regular basis. Some users will simply replace the bath with new solvent and dispose of the contaminated solvent. However, this practice increases operational costs and interrupts the cleaning process.

An in-house solvent recycling system such as Kyzen Corp.’s Kapture recycling system ensures that parts being cleaned are exposed to a high purity level of solvent, thus improving final part cleanliness levels. Recycling also extends bath life and consolidates the soils, reducing waste volume and operational cost.

How the System Works

As there are numerous benefits to solvent recycling, one of the most critical is maintaining a high solvent purity level. Typical degreaser solvent cook-down without a recycling system generally occurs at 12% soil loading, which is approximately every 4 to 6 weeks based on solvent volume. However, using the recycling unit automatically removes soils from the boil chamber in the degreaser on a continuous basis during operation hours, creating a consistent solvent purity level. By implementing Kapture on a degreasing unit, the waste is automatically separated from the solvent for required periodic disposal, and the fresh solvent is released to the degreaser in small increments.

The recycling system requires no maintenance until the waste storage container located inside the recycling cabinet has reached the preset capacity (approximately 80% full). Until the capacity is reached, however, the system condenses the waste volume to conserve solvent and reduce the disposal stream.

Kapture consists of all components mounted in a cabinet that can be easily moved to the proper position. It can be connected to most degreasers with a line from the recycling unit’s transfer pump and a gravity return

line for the recycled clean solvent for reuse. A 120 volt alternating current (VAC) at 15 amps and a compressed air supply are needed, but no water is required.

Reclaiming Solvent Makes Sense

Recycling solvent, whether on a continuous basis or a random batch-type operation, offers other benefits as well. First, contaminants from the solvent bath are removed, which increases bath life, decreases the frequency of solvent replacement and reduces the amount of solvent that is normally sent out as hazardous waste.

Recycling also reduces the overall solvent usage/cost on a yearly basis. The amount of good, reusable solvent that would normally be entrained in the contaminated solvent bath when replaced in a typical vapor degreaser without a recycling system may be as high as 50 to 75% by volume. Companies can lower this entrained amount to expected levels of 5% or less by reclaiming the solvent.

Also, by using on-site recycling, a machine shop can reduce the environmental assessment of the degreasing system by solvent conservation. The user’s air permit for the degreaser system is typically limited to a gross amount of solvent usage stated in pounds or tons per year. Less solvent shipped out as a waste product equates to less solvent assessed toward the permitted limit and fewer dollars spent for disposal.