On January 29, the commodity parity index between isooctanol and DOP on Business Society was 116.73, an increase of 1.26 points from the previous day. Compared to the cycle's highest point of 147.70 (February 7, 2022), it decreased by 20.97%, and compared to the lowest point of 91.74 (November 3, 2015), it increased by 27.24%. (Note: The cycle refers to the period from January 1, 2012, to the present.) The price of isooctanol rose, and the price of DOP increased, with reduced downward pressure and strengthened upward momentum for DOP.

On January 29, the commodity parity index between phthalic anhydride and DOP on Business Society was 85.94, a decrease of 0.95 points from the previous day. Compared to the cycle's highest point of 113.13 (October 16, 2022), it decreased by 24.03%, and compared to the lowest point of 45.17 (July 27, 2021), it increased by 90.26%. (Note: The cycle refers to the period from January 1, 2012, to the present.) The price of phthalic anhydride fluctuated and consolidated, while the price of DOP fluctuated and rose, with increased upward momentum for DOP but still existing downward pressure.

On January 30, the DOP market in the Jiangsu region stabilized, with quotations at 8,050 yuan/ton. In the Shandong region, the DOP market also stabilized, with quotations at 7,900 yuan/ton. In the Zhejiang region, the DOP market stabilized as well, with quotations at 8,150 yuan/ton.

On January 30, the price of phthalic anhydride, a raw material for DOP, remained weak and consolidated, while the price of isooctanol stabilized with fluctuations. The cost of DOP raw materials stabilized, and DOP production capacity decreased. Downstream market conditions were average, with demand primarily driven by necessity. Downstream customers' purchasing willingness was moderate, and transaction prices were negotiated. DOP quotations ranged from 7,900 to 8,100 yuan/ton, stabilizing overall. Actual transaction prices also stabilized. The positive factors for DOP weakened, while negative factors persisted, leading to a stable DOP market.