Propylene Prices Warm After Decline; Supply-Demand Tug-of-War May Cap Rebound Potential

Lead: Domestic propylene prices in China were downturn-softened and then turned warmer this week. In the early stage, prices fell rapidly under dual pressure from weakened cost support and softer downstream demand. As suppliers continued to concede on prices, downstream demand recovered marginally, market trading sentiment improved, and the transaction price center moved modestly upward. As of September 7, the average mainstream propylene price in Shandong was 9,040 yuan/ton, up 0.22% from the August 31 level. Looking ahead, supply additions continue to materialize, while the external procurement gap of integrated producers is gradually narrowing, which may limit the market’s overall rebound space.

I. Supply: Concentrated unit restarts release additional supply

This week, propylene plant activity in Shandong was dominated by restarts after maintenance. Multiple units, including Wanhua Yantai, Wantong Petrochemical, Qixiang Tengda, and Tianhong Chemical, resumed production in succession, releasing incremental supply and lifting regional output.

According to data, from August 31 to September 7, Shandong’s daily propylene output rose from 32,300 tons to 34,700 tons, an increase of 2,400 tons, or 7.43%. Daily capacity utilization recovered from 63.2% to 67.9%, up 4.8 percentage points, with regional operating rates clearly improving.

In other regions, the Sierbang unit in East China continued to ramp up, and the No. 6 unit of Liaoning Kingfa in Northeast China completed its restart, providing a certain amount of supplemental supply to local markets.

Looking ahead, with units such as Tianhong Chemical’s FCC plant and Lijin Refining & Chemical gradually coming back online, Shandong’s propylene supply increase will be further realized, and short-term supply is expected to become more ample.

II. Demand: Restarts alongside maintenance; external purchases support basic demand

During the period, Shandong PDH production margins moved out of their earlier deep-loss zone and improved upward, supported by the correction in feedstock propane prices and the earlier high propylene prices. Among downstream derivatives, performance diverged slightly. PP powder, octanol, and propylene oxide benefited from lower feedstock costs, with profitability recovering significantly from August 31, up 106%, 69%, and 51%, respectively. The profit recovery stimulated downstream producers to renew feedstock purchasing. Acrylonitrile margins fell notably over the period, but downstream plants maintained operational requirements, sustaining certain procurement demand for propylene feedstock. Although margins remained under pressure, the basic feedstock demand from running plants still existed, and raw-material purchasing was not fully abandoned.

Table 3 Selected downstream unit changes in Shandong (10,000 t/a; 10,000 tons)

Note: These are theoretical values, calculated based on product output and unit consumption, and are intended for trend reference only.

On the downstream unit front, only Qilu Petrochemical’s octanol plant in Shandong completed its restart during the week, adding 400 tons in theoretical propylene demand. Other downstream operations remained stable. Looking ahead, units such as Qixiang Tengda’s PO plant, Lihuayi’s octanol plant, and Kairi’s PP powder plant will restart successively, and the combined new theoretical propylene demand is expected to be about 6,400 tons in the short term, suggesting further upside in downstream propylene purchasing demand. However, actual unit load-raising progress and product profitability changes will both affect real feedstock consumption, so the pace of demand release still needs to be tracked.

III. Price spreads: Processing spread widens; demand confirmation pending

Judging from the price spread trend between PP powder, the key downstream product, and propylene, the spread trended wider during the period. As of September 7, the spread was 460 yuan/ton, up 180 yuan/ton from August 31. If the spread continues to widen, previously sidelined downstream units may return to operation, providing a further boost to demand. Nevertheless, unit restarts do not depend solely on theoretical spreads; they also face constraints from downstream order inflows and maintenance schedules. Therefore, the actual pace of demand release remains to be seen.

IV. Outlook: Long and short interplay; upside limited

Cost side: Uncertainties in Middle East geopolitics persist, and propane and crude oil price fluctuations will continue to affect the strength of cost support for propylene.

Supply side: Multiple Shandong maintenance units are gradually completing restarts, while outside-region units are also raising operating rates. The expectation of incremental supply is clear, and regional supply pressure is set to increase.

Demand side: Downstream units are coming back online gradually, suggesting an increase in theoretical propylene demand. Yet the external procurement gap of integrated producers is steadily shrinking, and the recovery in processing margins for downstream products such as PP powder is limited, which will notably constrain feedstock purchases.

On balance, propylene supply and demand are both set to see marginal increases, but downstream demand repair is unlikely to fully absorb the supply addition. Propylene prices are expected to probe levels in volatile fashion in the very short term, but the overall upside is limited. The mainstream price may fluctuate within the 8,700–9,300 yuan/ton range.

Key factors to watch:

1. The actual restart progress and marketable supply release of pending-restart units in Shandong;
2. The sustainability of profitability for downstream products such as PP powder and octanol, as well as the follow-through strength of actual downstream procurement;
3. Cost changes arising from international geopolitical developments and propane/crude oil price movements.