A process for recovering polyester from polyester/wool blend
A technology for recycling polyester and mixtures, which is applied in the biochemical treatment of enzymes/microorganisms, plastic recycling, recycling technology, etc. It can solve the problems of troublesome recycling process, complicated methods, and expensive hydrolyzing agents.
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Embodiment 1
[0046] Example 1: Enzymatic hydrolysis of PET / wool (75:25)
[0047] sample: PET / wool (75:25)
[0048] Multiple hydrolysis tests were performed on PET / wool (75:25) fabric to achieve separation of PET and wool. Table 1 below lists these tests and the results obtained.
[0049] In the test to detect alkaline hydrolysis, PET / wool (75:25) was hydrolyzed by autoclaving with 4% NaOH at 121° C. for 15 minutes. In another experiment, non-alkali-treated PET / wool was incubated at 50°C with protease (papain, SRL ltd) followed by lipase (Sigma Aldrich) in the presence of 100 mM sodium phosphate buffer, pH 7.0 ( 75:25). A 0.1 g sample was taken per 40 ml of buffer. The incubation time for protease treatment was 16 hours, and that for lipase was 48 hours. The concentration of both enzymes was 5g / L.
[0050] Results (Table 1) and scanning electron microscope (SEM) images ( figure 1 )show:
[0051] Alkaline treatment alone is sufficient to remove wool from the mix;
[0052] • Enzyme...
Embodiment 2
[0056] Embodiment 2: the effect of different bases
[0057] sample: PET / wool (75:25) fabric
[0058] A sample of PET / wool fabric mixture (75:25) weighing 0.5 g was pretreated with different alkalis, such as 0.5% (w / v) sodium carbonate, 0.5% (w / v) sodium hydroxide, 0.5% (w / v) v) Calcium carbonate and 0.5% (w / v) calcium hydroxide. The experimental fabric loading was 1.25% (w / v), and the samples were autoclaved in lye for 15 minutes at 121°C. After autoclaving, fabric samples were rinsed thoroughly to remove residual alkali, and weight loss was recorded after drying.
[0059] It was observed that 0.5% CaCO 3 Inability to separate wool from PET ( figure 2 A). Similarly, with 0.5% Na 2 CO 3 Traces of wool fibers were seen after treatment ( figure 2 B). With 0.5% Ca(OH) 2 ( figure 2 C) and 0.5% NaOH ( figure 2 D) Complete removal of wool is observed after treatment.
[0060] Results (Table 2) and scanning electron microscope (SEM) images ( figure 2 )show:
[00...
Embodiment 3
[0066] Embodiment 3: process optimization - lye concentration
[0067] sample: PET / wool (75:25)
[0068] With different concentrations (0-4%) of Na 2 CO 3 Pre-treated PET / wool fabric (75:25) with a fabric loading of 1.25% (w / v) - with 40ml Na 2 CO 3 and 0.5g fabric sample for pretreatment. Autoclaving was performed at 121° C. for 15 minutes. After autoclaving, fabric samples were rinsed thoroughly to remove residual alkali, and weight loss was recorded after drying.
[0069] Results (Table 3) and SEM images ( image 3 ) clearly shows that the concentration of 1% and above Na 2 CO 3 The treatment removes the wool completely. The untreated fabric samples showed no weight loss.
[0070] Table 3: Na 2 CO 3 Concentration optimization
[0071] Na 2 CO 3 concentration(%)
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